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Finding the Fourth Proportional to 913.88, 1,261.61 and 615.20

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Solution

The fourth proportional to 913.88, 1,261.61 and 615.20 is: 849.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.88 : 1,261.61 = 615.20 : x
  2. Step 2: Convert to fraction form
    913.88/1,261.61 = 615.20/x
  3. Step 3: Cross multiply
    913.88x = 1,261.61 × 615.20
  4. Step 4: Simplify right side
    913.88x = 776,135.39
  5. Step 5: Solve for x
    x = 776,135.39/913.88
  6. Step 6: Final answer
    x = 849.27

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Double scale
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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.