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Finding the Fourth Proportional to 1,440.61, 2,161.13 and 618.86

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Solution

The fourth proportional to 1,440.61, 2,161.13 and 618.86 is: 928.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.61 : 2,161.13 = 618.86 : x
  2. Step 2: Convert to fraction form
    1,440.61/2,161.13 = 618.86/x
  3. Step 3: Cross multiply
    1,440.61x = 2,161.13 × 618.86
  4. Step 4: Simplify right side
    1,440.61x = 1,337,436.91
  5. Step 5: Solve for x
    x = 1,337,436.91/1,440.61
  6. Step 6: Final answer
    x = 928.38

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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.