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Finding the Fourth Proportional to 661,121,011.80, 991,681,517.70 and 620,810,227.80

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Solution

The fourth proportional to 661,121,011.80, 991,681,517.70 and 620,810,227.80 is: 931,215,341.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,121,011.80 : 991,681,517.70 = 620,810,227.80 : x
  2. Step 2: Convert to fraction form
    661,121,011.80/991,681,517.70 = 620,810,227.80/x
  3. Step 3: Cross multiply
    661,121,011.80x = 991,681,517.70 × 620,810,227.80
  4. Step 4: Simplify right side
    661,121,011.80x = 615,646,028,908,386,688
  5. Step 5: Solve for x
    x = 615,646,028,908,386,688/661,121,011.80
  6. Step 6: Final answer
    x = 931,215,341.70

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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.