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Finding the Fourth Proportional to 145,539,985.80, 218,309,978.70 and 72,767,998.20

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Solution

The fourth proportional to 145,539,985.80, 218,309,978.70 and 72,767,998.20 is: 109,151,997.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,539,985.80 : 218,309,978.70 = 72,767,998.20 : x
  2. Step 2: Convert to fraction form
    145,539,985.80/218,309,978.70 = 72,767,998.20/x
  3. Step 3: Cross multiply
    145,539,985.80x = 218,309,978.70 × 72,767,998.20
  4. Step 4: Simplify right side
    145,539,985.80x = 15,885,980,137,083,638
  5. Step 5: Solve for x
    x = 15,885,980,137,083,638/145,539,985.80
  6. Step 6: Final answer
    x = 109,151,997.30

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.