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Finding the Fourth Proportional to 687.11, 947.93 and 392.31

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Solution

The fourth proportional to 687.11, 947.93 and 392.31 is: 541.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.11 : 947.93 = 392.31 : x
  2. Step 2: Convert to fraction form
    687.11/947.93 = 392.31/x
  3. Step 3: Cross multiply
    687.11x = 947.93 × 392.31
  4. Step 4: Simplify right side
    687.11x = 371,885.77
  5. Step 5: Solve for x
    x = 371,885.77/687.11
  6. Step 6: Final answer
    x = 541.23

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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.