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Finding the Fourth Proportional to 3,123, 4,681.25 and 1,478.29

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Solution

The fourth proportional to 3,123, 4,681.25 and 1,478.29 is: 2,215.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,123 : 4,681.25 = 1,478.29 : x
  2. Step 2: Convert to fraction form
    3,123/4,681.25 = 1,478.29/x
  3. Step 3: Cross multiply
    3,123x = 4,681.25 × 1,478.29
  4. Step 4: Simplify right side
    3,123x = 6,920,245.06
  5. Step 5: Solve for x
    x = 6,920,245.06/3,123
  6. Step 6: Final answer
    x = 2,215.90

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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.