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Finding the Fourth Proportional to 708,851,506.26, 978,189,435.89 and 391,304,931.78

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Solution

The fourth proportional to 708,851,506.26, 978,189,435.89 and 391,304,931.78 is: 539,986,650.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,851,506.26 : 978,189,435.89 = 391,304,931.78 : x
  2. Step 2: Convert to fraction form
    708,851,506.26/978,189,435.89 = 391,304,931.78/x
  3. Step 3: Cross multiply
    708,851,506.26x = 978,189,435.89 × 391,304,931.78
  4. Step 4: Simplify right side
    708,851,506.26x = 382,770,350,482,032,192
  5. Step 5: Solve for x
    x = 382,770,350,482,032,192/708,851,506.26
  6. Step 6: Final answer
    x = 539,986,650.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.