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Finding the Fourth Proportional to 72,656.80, 108,985.20 and 45,008.80

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Solution

The fourth proportional to 72,656.80, 108,985.20 and 45,008.80 is: 67,513.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,656.80 : 108,985.20 = 45,008.80 : x
  2. Step 2: Convert to fraction form
    72,656.80/108,985.20 = 45,008.80/x
  3. Step 3: Cross multiply
    72,656.80x = 108,985.20 × 45,008.80
  4. Step 4: Simplify right side
    72,656.80x = 4,905,293,069.76
  5. Step 5: Solve for x
    x = 4,905,293,069.76/72,656.80
  6. Step 6: Final answer
    x = 67,513.20

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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.