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Finding the Fourth Proportional to 687.33, 948.28 and 392.39

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Solution

The fourth proportional to 687.33, 948.28 and 392.39 is: 541.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.33 : 948.28 = 392.39 : x
  2. Step 2: Convert to fraction form
    687.33/948.28 = 392.39/x
  3. Step 3: Cross multiply
    687.33x = 948.28 × 392.39
  4. Step 4: Simplify right side
    687.33x = 372,095.59
  5. Step 5: Solve for x
    x = 372,095.59/687.33
  6. Step 6: Final answer
    x = 541.36

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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.