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Finding the Fourth Proportional to 912.61, 1,368.33 and 392.95

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Solution

The fourth proportional to 912.61, 1,368.33 and 392.95 is: 589.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.61 : 1,368.33 = 392.95 : x
  2. Step 2: Convert to fraction form
    912.61/1,368.33 = 392.95/x
  3. Step 3: Cross multiply
    912.61x = 1,368.33 × 392.95
  4. Step 4: Simplify right side
    912.61x = 537,685.27
  5. Step 5: Solve for x
    x = 537,685.27/912.61
  6. Step 6: Final answer
    x = 589.17

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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.