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Finding the Fourth Proportional to 1,615.76, 2,229.60 and 917

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Solution

The fourth proportional to 1,615.76, 2,229.60 and 917 is: 1,265.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.76 : 2,229.60 = 917 : x
  2. Step 2: Convert to fraction form
    1,615.76/2,229.60 = 917/x
  3. Step 3: Cross multiply
    1,615.76x = 2,229.60 × 917
  4. Step 4: Simplify right side
    1,615.76x = 2,044,543.20
  5. Step 5: Solve for x
    x = 2,044,543.20/1,615.76
  6. Step 6: Final answer
    x = 1,265.38

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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.