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Finding the Fourth Proportional to 913, 1,368.18 and 392.86

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Solution

The fourth proportional to 913, 1,368.18 and 392.86 is: 588.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    913 : 1,368.18 = 392.86 : x
  2. Step 2: Convert to fraction form
    913/1,368.18 = 392.86/x
  3. Step 3: Cross multiply
    913x = 1,368.18 × 392.86
  4. Step 4: Simplify right side
    913x = 537,503.19
  5. Step 5: Solve for x
    x = 537,503.19/913
  6. Step 6: Final answer
    x = 588.72

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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.