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Finding the Fourth Proportional to 661,931,066.88, 992,564,409.60 and 385,671,559.68

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Solution

The fourth proportional to 661,931,066.88, 992,564,409.60 and 385,671,559.68 is: 578,313,789.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,931,066.88 : 992,564,409.60 = 385,671,559.68 : x
  2. Step 2: Convert to fraction form
    661,931,066.88/992,564,409.60 = 385,671,559.68/x
  3. Step 3: Cross multiply
    661,931,066.88x = 992,564,409.60 × 385,671,559.68
  4. Step 4: Simplify right side
    661,931,066.88x = 382,803,863,933,290,368
  5. Step 5: Solve for x
    x = 382,803,863,933,290,368/661,931,066.88
  6. Step 6: Final answer
    x = 578,313,789.89

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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.