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Finding the Fourth Proportional to 691.88, 955.40 and 518.13

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Solution

The fourth proportional to 691.88, 955.40 and 518.13 is: 715.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.88 : 955.40 = 518.13 : x
  2. Step 2: Convert to fraction form
    691.88/955.40 = 518.13/x
  3. Step 3: Cross multiply
    691.88x = 955.40 × 518.13
  4. Step 4: Simplify right side
    691.88x = 495,018.81
  5. Step 5: Solve for x
    x = 495,018.81/691.88
  6. Step 6: Final answer
    x = 715.47

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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.