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Finding the Fourth Proportional to 1,391.79, 2,088.24 and 621.75

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Solution

The fourth proportional to 1,391.79, 2,088.24 and 621.75 is: 932.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.79 : 2,088.24 = 621.75 : x
  2. Step 2: Convert to fraction form
    1,391.79/2,088.24 = 621.75/x
  3. Step 3: Cross multiply
    1,391.79x = 2,088.24 × 621.75
  4. Step 4: Simplify right side
    1,391.79x = 1,298,363.22
  5. Step 5: Solve for x
    x = 1,298,363.22/1,391.79
  6. Step 6: Final answer
    x = 932.87

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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.