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Finding the Fourth Proportional to 1,242.04, 1,865.76 and 755.40

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Solution

The fourth proportional to 1,242.04, 1,865.76 and 755.40 is: 1,134.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.04 : 1,865.76 = 755.40 : x
  2. Step 2: Convert to fraction form
    1,242.04/1,865.76 = 755.40/x
  3. Step 3: Cross multiply
    1,242.04x = 1,865.76 × 755.40
  4. Step 4: Simplify right side
    1,242.04x = 1,409,395.10
  5. Step 5: Solve for x
    x = 1,409,395.10/1,242.04
  6. Step 6: Final answer
    x = 1,134.74

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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.