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Finding the Fourth Proportional to 1,125.54, 1,687.95 and 345.51

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Solution

The fourth proportional to 1,125.54, 1,687.95 and 345.51 is: 518.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.54 : 1,687.95 = 345.51 : x
  2. Step 2: Convert to fraction form
    1,125.54/1,687.95 = 345.51/x
  3. Step 3: Cross multiply
    1,125.54x = 1,687.95 × 345.51
  4. Step 4: Simplify right side
    1,125.54x = 583,203.60
  5. Step 5: Solve for x
    x = 583,203.60/1,125.54
  6. Step 6: Final answer
    x = 518.15

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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.