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Finding the Fourth Proportional to 1,129.55, 1,693.90 and 388.95

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Solution

The fourth proportional to 1,129.55, 1,693.90 and 388.95 is: 583.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.55 : 1,693.90 = 388.95 : x
  2. Step 2: Convert to fraction form
    1,129.55/1,693.90 = 388.95/x
  3. Step 3: Cross multiply
    1,129.55x = 1,693.90 × 388.95
  4. Step 4: Simplify right side
    1,129.55x = 658,840.46
  5. Step 5: Solve for x
    x = 658,840.46/1,129.55
  6. Step 6: Final answer
    x = 583.28

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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.