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Finding the Fourth Proportional to 913.15, 1,369.71 and 619.92

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Solution

The fourth proportional to 913.15, 1,369.71 and 619.92 is: 929.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.15 : 1,369.71 = 619.92 : x
  2. Step 2: Convert to fraction form
    913.15/1,369.71 = 619.92/x
  3. Step 3: Cross multiply
    913.15x = 1,369.71 × 619.92
  4. Step 4: Simplify right side
    913.15x = 849,107.52
  5. Step 5: Solve for x
    x = 849,107.52/913.15
  6. Step 6: Final answer
    x = 929.87

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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.