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Finding the Fourth Proportional to 1,077.76, 1,487.28 and 612.16

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Solution

The fourth proportional to 1,077.76, 1,487.28 and 612.16 is: 844.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.76 : 1,487.28 = 612.16 : x
  2. Step 2: Convert to fraction form
    1,077.76/1,487.28 = 612.16/x
  3. Step 3: Cross multiply
    1,077.76x = 1,487.28 × 612.16
  4. Step 4: Simplify right side
    1,077.76x = 910,453.32
  5. Step 5: Solve for x
    x = 910,453.32/1,077.76
  6. Step 6: Final answer
    x = 844.76

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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.