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Finding the Fourth Proportional to 661,119,447.80, 991,679,171.70 and 620,808,663.80

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Solution

The fourth proportional to 661,119,447.80, 991,679,171.70 and 620,808,663.80 is: 931,212,995.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,119,447.80 : 991,679,171.70 = 620,808,663.80 : x
  2. Step 2: Convert to fraction form
    661,119,447.80/991,679,171.70 = 620,808,663.80/x
  3. Step 3: Cross multiply
    661,119,447.80x = 991,679,171.70 × 620,808,663.80
  4. Step 4: Simplify right side
    661,119,447.80x = 615,643,021,501,367,808
  5. Step 5: Solve for x
    x = 615,643,021,501,367,808/661,119,447.80
  6. Step 6: Final answer
    x = 931,212,995.70

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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.