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Finding the Fourth Proportional to 753.81, 1,130.31 and 388.11

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Solution

The fourth proportional to 753.81, 1,130.31 and 388.11 is: 581.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.81 : 1,130.31 = 388.11 : x
  2. Step 2: Convert to fraction form
    753.81/1,130.31 = 388.11/x
  3. Step 3: Cross multiply
    753.81x = 1,130.31 × 388.11
  4. Step 4: Simplify right side
    753.81x = 438,684.61
  5. Step 5: Solve for x
    x = 438,684.61/753.81
  6. Step 6: Final answer
    x = 581.96

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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.