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Finding the Fourth Proportional to 47,843,985.40, 71,765,978.10 and 28,664,870.20

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Solution

The fourth proportional to 47,843,985.40, 71,765,978.10 and 28,664,870.20 is: 42,997,305.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,843,985.40 : 71,765,978.10 = 28,664,870.20 : x
  2. Step 2: Convert to fraction form
    47,843,985.40/71,765,978.10 = 28,664,870.20/x
  3. Step 3: Cross multiply
    47,843,985.40x = 71,765,978.10 × 28,664,870.20
  4. Step 4: Simplify right side
    47,843,985.40x = 2,057,162,447,012,542.50
  5. Step 5: Solve for x
    x = 2,057,162,447,012,542.50/47,843,985.40
  6. Step 6: Final answer
    x = 42,997,305.30

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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.