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Finding the Fourth Proportional to 913.27, 1,368.74 and 392.65

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Solution

The fourth proportional to 913.27, 1,368.74 and 392.65 is: 588.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.27 : 1,368.74 = 392.65 : x
  2. Step 2: Convert to fraction form
    913.27/1,368.74 = 392.65/x
  3. Step 3: Cross multiply
    913.27x = 1,368.74 × 392.65
  4. Step 4: Simplify right side
    913.27x = 537,435.76
  5. Step 5: Solve for x
    x = 537,435.76/913.27
  6. Step 6: Final answer
    x = 588.47

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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.