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Finding the Fourth Proportional to 1,124.92, 1,687.20 and 355.60

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Solution

The fourth proportional to 1,124.92, 1,687.20 and 355.60 is: 533.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.92 : 1,687.20 = 355.60 : x
  2. Step 2: Convert to fraction form
    1,124.92/1,687.20 = 355.60/x
  3. Step 3: Cross multiply
    1,124.92x = 1,687.20 × 355.60
  4. Step 4: Simplify right side
    1,124.92x = 599,968.32
  5. Step 5: Solve for x
    x = 599,968.32/1,124.92
  6. Step 6: Final answer
    x = 533.34

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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.