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Finding the Fourth Proportional to 913.17, 1,261.20 and 814.77

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Solution

The fourth proportional to 913.17, 1,261.20 and 814.77 is: 1,125.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.17 : 1,261.20 = 814.77 : x
  2. Step 2: Convert to fraction form
    913.17/1,261.20 = 814.77/x
  3. Step 3: Cross multiply
    913.17x = 1,261.20 × 814.77
  4. Step 4: Simplify right side
    913.17x = 1,027,587.92
  5. Step 5: Solve for x
    x = 1,027,587.92/913.17
  6. Step 6: Final answer
    x = 1,125.30

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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.