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Finding the Fourth Proportional to 913.02, 1,259.99 and 520.14

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Solution

The fourth proportional to 913.02, 1,259.99 and 520.14 is: 717.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.02 : 1,259.99 = 520.14 : x
  2. Step 2: Convert to fraction form
    913.02/1,259.99 = 520.14/x
  3. Step 3: Cross multiply
    913.02x = 1,259.99 × 520.14
  4. Step 4: Simplify right side
    913.02x = 655,371.20
  5. Step 5: Solve for x
    x = 655,371.20/913.02
  6. Step 6: Final answer
    x = 717.81

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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.