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Finding the Fourth Proportional to 922.40, 1,270.32 and 902.24

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Solution

The fourth proportional to 922.40, 1,270.32 and 902.24 is: 1,242.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.40 : 1,270.32 = 902.24 : x
  2. Step 2: Convert to fraction form
    922.40/1,270.32 = 902.24/x
  3. Step 3: Cross multiply
    922.40x = 1,270.32 × 902.24
  4. Step 4: Simplify right side
    922.40x = 1,146,133.52
  5. Step 5: Solve for x
    x = 1,146,133.52/922.40
  6. Step 6: Final answer
    x = 1,242.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.