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Finding the Fourth Proportional to 928.49, 1,384.55 and 920.16

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Solution

The fourth proportional to 928.49, 1,384.55 and 920.16 is: 1,372.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.49 : 1,384.55 = 920.16 : x
  2. Step 2: Convert to fraction form
    928.49/1,384.55 = 920.16/x
  3. Step 3: Cross multiply
    928.49x = 1,384.55 × 920.16
  4. Step 4: Simplify right side
    928.49x = 1,274,002.93
  5. Step 5: Solve for x
    x = 1,274,002.93/928.49
  6. Step 6: Final answer
    x = 1,372.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.