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Finding the Fourth Proportional to 686.93, 948.79 and 500.13

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Solution

The fourth proportional to 686.93, 948.79 and 500.13 is: 690.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.93 : 948.79 = 500.13 : x
  2. Step 2: Convert to fraction form
    686.93/948.79 = 500.13/x
  3. Step 3: Cross multiply
    686.93x = 948.79 × 500.13
  4. Step 4: Simplify right side
    686.93x = 474,518.34
  5. Step 5: Solve for x
    x = 474,518.34/686.93
  6. Step 6: Final answer
    x = 690.78

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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.