Home / 85,971,781.80-128,957,672.70-66,488,236.20

Finding the Fourth Proportional to 85,971,781.80, 128,957,672.70 and 66,488,236.20

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Solution

The fourth proportional to 85,971,781.80, 128,957,672.70 and 66,488,236.20 is: 99,732,354.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,971,781.80 : 128,957,672.70 = 66,488,236.20 : x
  2. Step 2: Convert to fraction form
    85,971,781.80/128,957,672.70 = 66,488,236.20/x
  3. Step 3: Cross multiply
    85,971,781.80x = 128,957,672.70 × 66,488,236.20
  4. Step 4: Simplify right side
    85,971,781.80x = 8,574,168,202,279,892
  5. Step 5: Solve for x
    x = 8,574,168,202,279,892/85,971,781.80
  6. Step 6: Final answer
    x = 99,732,354.30

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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.