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Finding the Fourth Proportional to 1,615.28, 2,229.12 and 916.64

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Solution

The fourth proportional to 1,615.28, 2,229.12 and 916.64 is: 1,264.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.28 : 2,229.12 = 916.64 : x
  2. Step 2: Convert to fraction form
    1,615.28/2,229.12 = 916.64/x
  3. Step 3: Cross multiply
    1,615.28x = 2,229.12 × 916.64
  4. Step 4: Simplify right side
    1,615.28x = 2,043,300.56
  5. Step 5: Solve for x
    x = 2,043,300.56/1,615.28
  6. Step 6: Final answer
    x = 1,264.98

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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.