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Finding the Fourth Proportional to 261,302,918.52, 391,978,794.42 and 77,070,574.20

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Solution

The fourth proportional to 261,302,918.52, 391,978,794.42 and 77,070,574.20 is: 115,613,062.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,302,918.52 : 391,978,794.42 = 77,070,574.20 : x
  2. Step 2: Convert to fraction form
    261,302,918.52/391,978,794.42 = 77,070,574.20/x
  3. Step 3: Cross multiply
    261,302,918.52x = 391,978,794.42 × 77,070,574.20
  4. Step 4: Simplify right side
    261,302,918.52x = 30,210,030,760,173,160
  5. Step 5: Solve for x
    x = 30,210,030,760,173,160/261,302,918.52
  6. Step 6: Final answer
    x = 115,613,062.92

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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.