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Finding the Fourth Proportional to 686.86, 948.05 and 392.23

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Solution

The fourth proportional to 686.86, 948.05 and 392.23 is: 541.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.86 : 948.05 = 392.23 : x
  2. Step 2: Convert to fraction form
    686.86/948.05 = 392.23/x
  3. Step 3: Cross multiply
    686.86x = 948.05 × 392.23
  4. Step 4: Simplify right side
    686.86x = 371,853.65
  5. Step 5: Solve for x
    x = 371,853.65/686.86
  6. Step 6: Final answer
    x = 541.38

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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.