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Finding the Fourth Proportional to 913.70, 1,260.84 and 515.34

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Solution

The fourth proportional to 913.70, 1,260.84 and 515.34 is: 711.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.70 : 1,260.84 = 515.34 : x
  2. Step 2: Convert to fraction form
    913.70/1,260.84 = 515.34/x
  3. Step 3: Cross multiply
    913.70x = 1,260.84 × 515.34
  4. Step 4: Simplify right side
    913.70x = 649,761.29
  5. Step 5: Solve for x
    x = 649,761.29/913.70
  6. Step 6: Final answer
    x = 711.13

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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.