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Finding the Fourth Proportional to 660,663.40, 990,781.85 and 187,221.64

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Solution

The fourth proportional to 660,663.40, 990,781.85 and 187,221.64 is: 280,772.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,663.40 : 990,781.85 = 187,221.64 : x
  2. Step 2: Convert to fraction form
    660,663.40/990,781.85 = 187,221.64/x
  3. Step 3: Cross multiply
    660,663.40x = 990,781.85 × 187,221.64
  4. Step 4: Simplify right side
    660,663.40x = 185,495,802,839.23
  5. Step 5: Solve for x
    x = 185,495,802,839.23/660,663.40
  6. Step 6: Final answer
    x = 280,772.03

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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.