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Finding the Fourth Proportional to 913.89, 1,261.13 and 515.57

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Solution

The fourth proportional to 913.89, 1,261.13 and 515.57 is: 711.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.89 : 1,261.13 = 515.57 : x
  2. Step 2: Convert to fraction form
    913.89/1,261.13 = 515.57/x
  3. Step 3: Cross multiply
    913.89x = 1,261.13 × 515.57
  4. Step 4: Simplify right side
    913.89x = 650,191.91
  5. Step 5: Solve for x
    x = 650,191.91/913.89
  6. Step 6: Final answer
    x = 711.45

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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.