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Finding the Fourth Proportional to 708,799,313.58, 978,143,233.14 and 391,259,736.69

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Solution

The fourth proportional to 708,799,313.58, 978,143,233.14 and 391,259,736.69 is: 539,938,536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,799,313.58 : 978,143,233.14 = 391,259,736.69 : x
  2. Step 2: Convert to fraction form
    708,799,313.58/978,143,233.14 = 391,259,736.69/x
  3. Step 3: Cross multiply
    708,799,313.58x = 978,143,233.14 × 391,259,736.69
  4. Step 4: Simplify right side
    708,799,313.58x = 382,708,063,843,461,696
  5. Step 5: Solve for x
    x = 382,708,063,843,461,696/708,799,313.58
  6. Step 6: Final answer
    x = 539,938,536.21

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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.