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Finding the Fourth Proportional to 915.16, 1,370.04 and 654.32

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Solution

The fourth proportional to 915.16, 1,370.04 and 654.32 is: 979.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.16 : 1,370.04 = 654.32 : x
  2. Step 2: Convert to fraction form
    915.16/1,370.04 = 654.32/x
  3. Step 3: Cross multiply
    915.16x = 1,370.04 × 654.32
  4. Step 4: Simplify right side
    915.16x = 896,444.57
  5. Step 5: Solve for x
    x = 896,444.57/915.16
  6. Step 6: Final answer
    x = 979.55

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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.