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Finding the Fourth Proportional to 913.85, 1,260.98 and 515.53

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Solution

The fourth proportional to 913.85, 1,260.98 and 515.53 is: 711.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.85 : 1,260.98 = 515.53 : x
  2. Step 2: Convert to fraction form
    913.85/1,260.98 = 515.53/x
  3. Step 3: Cross multiply
    913.85x = 1,260.98 × 515.53
  4. Step 4: Simplify right side
    913.85x = 650,066.71
  5. Step 5: Solve for x
    x = 650,066.71/913.85
  6. Step 6: Final answer
    x = 711.35

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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.