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Finding the Fourth Proportional to 913.28, 1,259.40 and 664.16

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Solution

The fourth proportional to 913.28, 1,259.40 and 664.16 is: 915.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.28 : 1,259.40 = 664.16 : x
  2. Step 2: Convert to fraction form
    913.28/1,259.40 = 664.16/x
  3. Step 3: Cross multiply
    913.28x = 1,259.40 × 664.16
  4. Step 4: Simplify right side
    913.28x = 836,443.10
  5. Step 5: Solve for x
    x = 836,443.10/913.28
  6. Step 6: Final answer
    x = 915.87

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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.