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Finding the Fourth Proportional to 652.32, 978.40 and 409.32

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Solution

The fourth proportional to 652.32, 978.40 and 409.32 is: 613.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.32 : 978.40 = 409.32 : x
  2. Step 2: Convert to fraction form
    652.32/978.40 = 409.32/x
  3. Step 3: Cross multiply
    652.32x = 978.40 × 409.32
  4. Step 4: Simplify right side
    652.32x = 400,478.69
  5. Step 5: Solve for x
    x = 400,478.69/652.32
  6. Step 6: Final answer
    x = 613.93

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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.