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Finding the Fourth Proportional to 1,129.88, 1,560 and 737.60

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Solution

The fourth proportional to 1,129.88, 1,560 and 737.60 is: 1,018.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.88 : 1,560 = 737.60 : x
  2. Step 2: Convert to fraction form
    1,129.88/1,560 = 737.60/x
  3. Step 3: Cross multiply
    1,129.88x = 1,560 × 737.60
  4. Step 4: Simplify right side
    1,129.88x = 1,150,648.20
  5. Step 5: Solve for x
    x = 1,150,648.20/1,129.88
  6. Step 6: Final answer
    x = 1,018.39

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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.