Home / 85,406,497.70-128,109,746.55-81,438,404.90

Finding the Fourth Proportional to 85,406,497.70, 128,109,746.55 and 81,438,404.90

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Solution

The fourth proportional to 85,406,497.70, 128,109,746.55 and 81,438,404.90 is: 122,157,607.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,406,497.70 : 128,109,746.55 = 81,438,404.90 : x
  2. Step 2: Convert to fraction form
    85,406,497.70/128,109,746.55 = 81,438,404.90/x
  3. Step 3: Cross multiply
    85,406,497.70x = 128,109,746.55 × 81,438,404.90
  4. Step 4: Simplify right side
    85,406,497.70x = 10,433,053,411,175,278
  5. Step 5: Solve for x
    x = 10,433,053,411,175,278/85,406,497.70
  6. Step 6: Final answer
    x = 122,157,607.35

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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.