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Finding the Fourth Proportional to 763,721.60, 1,142,860.80 and 664,966.40

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Solution

The fourth proportional to 763,721.60, 1,142,860.80 and 664,966.40 is: 995,079.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    763,721.60 : 1,142,860.80 = 664,966.40 : x
  2. Step 2: Convert to fraction form
    763,721.60/1,142,860.80 = 664,966.40/x
  3. Step 3: Cross multiply
    763,721.60x = 1,142,860.80 × 664,966.40
  4. Step 4: Simplify right side
    763,721.60x = 759,964,031,877.12
  5. Step 5: Solve for x
    x = 759,964,031,877.12/763,721.60
  6. Step 6: Final answer
    x = 995,079.92

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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.