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Finding the Fourth Proportional to 1,078, 1,487.68 and 612.24

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Solution

The fourth proportional to 1,078, 1,487.68 and 612.24 is: 844.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078 : 1,487.68 = 612.24 : x
  2. Step 2: Convert to fraction form
    1,078/1,487.68 = 612.24/x
  3. Step 3: Cross multiply
    1,078x = 1,487.68 × 612.24
  4. Step 4: Simplify right side
    1,078x = 910,817.20
  5. Step 5: Solve for x
    x = 910,817.20/1,078
  6. Step 6: Final answer
    x = 844.91

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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.