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Finding the Fourth Proportional to 708,799,567.89, 978,143,583.74 and 391,259,990.19

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Solution

The fourth proportional to 708,799,567.89, 978,143,583.74 and 391,259,990.19 is: 539,938,885.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,799,567.89 : 978,143,583.74 = 391,259,990.19 : x
  2. Step 2: Convert to fraction form
    708,799,567.89/978,143,583.74 = 391,259,990.19/x
  3. Step 3: Cross multiply
    708,799,567.89x = 978,143,583.74 × 391,259,990.19
  4. Step 4: Simplify right side
    708,799,567.89x = 382,708,448,976,567,552
  5. Step 5: Solve for x
    x = 382,708,448,976,567,552/708,799,567.89
  6. Step 6: Final answer
    x = 539,938,885.85

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1.5x scale

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.