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Finding the Fourth Proportional to 686.87, 948.06 and 392.24

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Solution

The fourth proportional to 686.87, 948.06 and 392.24 is: 541.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.87 : 948.06 = 392.24 : x
  2. Step 2: Convert to fraction form
    686.87/948.06 = 392.24/x
  3. Step 3: Cross multiply
    686.87x = 948.06 × 392.24
  4. Step 4: Simplify right side
    686.87x = 371,867.05
  5. Step 5: Solve for x
    x = 371,867.05/686.87
  6. Step 6: Final answer
    x = 541.39

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1.5x scale

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.