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Finding the Fourth Proportional to 912.50, 1,368.67 and 392.48

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Solution

The fourth proportional to 912.50, 1,368.67 and 392.48 is: 588.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.50 : 1,368.67 = 392.48 : x
  2. Step 2: Convert to fraction form
    912.50/1,368.67 = 392.48/x
  3. Step 3: Cross multiply
    912.50x = 1,368.67 × 392.48
  4. Step 4: Simplify right side
    912.50x = 537,174.38
  5. Step 5: Solve for x
    x = 537,174.38/912.50
  6. Step 6: Final answer
    x = 588.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.