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Finding the Fourth Proportional to 1,486.72, 2,229.40 and 870.63

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Solution

The fourth proportional to 1,486.72, 2,229.40 and 870.63 is: 1,305.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.72 : 2,229.40 = 870.63 : x
  2. Step 2: Convert to fraction form
    1,486.72/2,229.40 = 870.63/x
  3. Step 3: Cross multiply
    1,486.72x = 2,229.40 × 870.63
  4. Step 4: Simplify right side
    1,486.72x = 1,940,982.52
  5. Step 5: Solve for x
    x = 1,940,982.52/1,486.72
  6. Step 6: Final answer
    x = 1,305.55

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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.