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Finding the Fourth Proportional to 687,221.76, 948,215.52 and 664,567.68

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Solution

The fourth proportional to 687,221.76, 948,215.52 and 664,567.68 is: 916,957.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,221.76 : 948,215.52 = 664,567.68 : x
  2. Step 2: Convert to fraction form
    687,221.76/948,215.52 = 664,567.68/x
  3. Step 3: Cross multiply
    687,221.76x = 948,215.52 × 664,567.68
  4. Step 4: Simplify right side
    687,221.76x = 630,153,388,266.39
  5. Step 5: Solve for x
    x = 630,153,388,266.39/687,221.76
  6. Step 6: Final answer
    x = 916,957.85

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.