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Finding the Fourth Proportional to 928.57, 1,391.32 and 653.32

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Solution

The fourth proportional to 928.57, 1,391.32 and 653.32 is: 978.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.57 : 1,391.32 = 653.32 : x
  2. Step 2: Convert to fraction form
    928.57/1,391.32 = 653.32/x
  3. Step 3: Cross multiply
    928.57x = 1,391.32 × 653.32
  4. Step 4: Simplify right side
    928.57x = 908,972.07
  5. Step 5: Solve for x
    x = 908,972.07/928.57
  6. Step 6: Final answer
    x = 978.90

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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.