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Finding the Fourth Proportional to 1,613.76, 2,227.12 and 915.20

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Solution

The fourth proportional to 1,613.76, 2,227.12 and 915.20 is: 1,263.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.76 : 2,227.12 = 915.20 : x
  2. Step 2: Convert to fraction form
    1,613.76/2,227.12 = 915.20/x
  3. Step 3: Cross multiply
    1,613.76x = 2,227.12 × 915.20
  4. Step 4: Simplify right side
    1,613.76x = 2,038,260.22
  5. Step 5: Solve for x
    x = 2,038,260.22/1,613.76
  6. Step 6: Final answer
    x = 1,263.05

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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.