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Finding the Fourth Proportional to 1,478.47, 2,213.41 and 860.29

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Solution

The fourth proportional to 1,478.47, 2,213.41 and 860.29 is: 1,287.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.47 : 2,213.41 = 860.29 : x
  2. Step 2: Convert to fraction form
    1,478.47/2,213.41 = 860.29/x
  3. Step 3: Cross multiply
    1,478.47x = 2,213.41 × 860.29
  4. Step 4: Simplify right side
    1,478.47x = 1,904,174.49
  5. Step 5: Solve for x
    x = 1,904,174.49/1,478.47
  6. Step 6: Final answer
    x = 1,287.94

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1.5x scale

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.