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Finding the Fourth Proportional to 71,781,207.20, 107,671,810.80 and 28,657,066.40

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Solution

The fourth proportional to 71,781,207.20, 107,671,810.80 and 28,657,066.40 is: 42,985,599.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,781,207.20 : 107,671,810.80 = 28,657,066.40 : x
  2. Step 2: Convert to fraction form
    71,781,207.20/107,671,810.80 = 28,657,066.40/x
  3. Step 3: Cross multiply
    71,781,207.20x = 107,671,810.80 × 28,657,066.40
  4. Step 4: Simplify right side
    71,781,207.20x = 3,085,558,231,503,837
  5. Step 5: Solve for x
    x = 3,085,558,231,503,837/71,781,207.20
  6. Step 6: Final answer
    x = 42,985,599.60

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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.