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Finding the Fourth Proportional to 954.29, 1,440.06 and 921.69

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Solution

The fourth proportional to 954.29, 1,440.06 and 921.69 is: 1,390.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.29 : 1,440.06 = 921.69 : x
  2. Step 2: Convert to fraction form
    954.29/1,440.06 = 921.69/x
  3. Step 3: Cross multiply
    954.29x = 1,440.06 × 921.69
  4. Step 4: Simplify right side
    954.29x = 1,327,288.90
  5. Step 5: Solve for x
    x = 1,327,288.90/954.29
  6. Step 6: Final answer
    x = 1,390.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.