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Finding the Fourth Proportional to 864.20, 1,296.30 and 572.60

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Solution

The fourth proportional to 864.20, 1,296.30 and 572.60 is: 858.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.20 : 1,296.30 = 572.60 : x
  2. Step 2: Convert to fraction form
    864.20/1,296.30 = 572.60/x
  3. Step 3: Cross multiply
    864.20x = 1,296.30 × 572.60
  4. Step 4: Simplify right side
    864.20x = 742,261.38
  5. Step 5: Solve for x
    x = 742,261.38/864.20
  6. Step 6: Final answer
    x = 858.90

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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.