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Finding the Fourth Proportional to 687.08, 948.26 and 392.34

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Solution

The fourth proportional to 687.08, 948.26 and 392.34 is: 541.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.08 : 948.26 = 392.34 : x
  2. Step 2: Convert to fraction form
    687.08/948.26 = 392.34/x
  3. Step 3: Cross multiply
    687.08x = 948.26 × 392.34
  4. Step 4: Simplify right side
    687.08x = 372,042.66
  5. Step 5: Solve for x
    x = 372,042.66/687.08
  6. Step 6: Final answer
    x = 541.48

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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.