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Finding the Fourth Proportional to 687.13, 948.18 and 392.36

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Solution

The fourth proportional to 687.13, 948.18 and 392.36 is: 541.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.13 : 948.18 = 392.36 : x
  2. Step 2: Convert to fraction form
    687.13/948.18 = 392.36/x
  3. Step 3: Cross multiply
    687.13x = 948.18 × 392.36
  4. Step 4: Simplify right side
    687.13x = 372,024.64
  5. Step 5: Solve for x
    x = 372,024.64/687.13
  6. Step 6: Final answer
    x = 541.42

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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.