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Finding the Fourth Proportional to 1,538.91, 2,124.17 and 909.41

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Solution

The fourth proportional to 1,538.91, 2,124.17 and 909.41 is: 1,255.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.91 : 2,124.17 = 909.41 : x
  2. Step 2: Convert to fraction form
    1,538.91/2,124.17 = 909.41/x
  3. Step 3: Cross multiply
    1,538.91x = 2,124.17 × 909.41
  4. Step 4: Simplify right side
    1,538.91x = 1,931,731.58
  5. Step 5: Solve for x
    x = 1,931,731.58/1,538.91
  6. Step 6: Final answer
    x = 1,255.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.