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Finding the Fourth Proportional to 913.98, 1,371.15 and 752.34

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Solution

The fourth proportional to 913.98, 1,371.15 and 752.34 is: 1,128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.98 : 1,371.15 = 752.34 : x
  2. Step 2: Convert to fraction form
    913.98/1,371.15 = 752.34/x
  3. Step 3: Cross multiply
    913.98x = 1,371.15 × 752.34
  4. Step 4: Simplify right side
    913.98x = 1,031,570.99
  5. Step 5: Solve for x
    x = 1,031,570.99/913.98
  6. Step 6: Final answer
    x = 1,128.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.