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Finding the Fourth Proportional to 686.07, 947.03 and 538.11

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Solution

The fourth proportional to 686.07, 947.03 and 538.11 is: 742.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.07 : 947.03 = 538.11 : x
  2. Step 2: Convert to fraction form
    686.07/947.03 = 538.11/x
  3. Step 3: Cross multiply
    686.07x = 947.03 × 538.11
  4. Step 4: Simplify right side
    686.07x = 509,603.62
  5. Step 5: Solve for x
    x = 509,603.62/686.07
  6. Step 6: Final answer
    x = 742.79

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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.