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Finding the Fourth Proportional to 659.28, 989.52 and 455.16

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Solution

The fourth proportional to 659.28, 989.52 and 455.16 is: 683.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.28 : 989.52 = 455.16 : x
  2. Step 2: Convert to fraction form
    659.28/989.52 = 455.16/x
  3. Step 3: Cross multiply
    659.28x = 989.52 × 455.16
  4. Step 4: Simplify right side
    659.28x = 450,389.92
  5. Step 5: Solve for x
    x = 450,389.92/659.28
  6. Step 6: Final answer
    x = 683.15

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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.