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Finding the Fourth Proportional to 660.40, 925.20 and 660.40

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Solution

The fourth proportional to 660.40, 925.20 and 660.40 is: 925.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.40 : 925.20 = 660.40 : x
  2. Step 2: Convert to fraction form
    660.40/925.20 = 660.40/x
  3. Step 3: Cross multiply
    660.40x = 925.20 × 660.40
  4. Step 4: Simplify right side
    660.40x = 611,002.08
  5. Step 5: Solve for x
    x = 611,002.08/660.40
  6. Step 6: Final answer
    x = 925.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.