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Finding the Fourth Proportional to 652.36, 978.72 and 461.20

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Solution

The fourth proportional to 652.36, 978.72 and 461.20 is: 691.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.36 : 978.72 = 461.20 : x
  2. Step 2: Convert to fraction form
    652.36/978.72 = 461.20/x
  3. Step 3: Cross multiply
    652.36x = 978.72 × 461.20
  4. Step 4: Simplify right side
    652.36x = 451,385.66
  5. Step 5: Solve for x
    x = 451,385.66/652.36
  6. Step 6: Final answer
    x = 691.93

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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.