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Finding the Fourth Proportional to 752.79, 1,038.89 and 438.15

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Solution

The fourth proportional to 752.79, 1,038.89 and 438.15 is: 604.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.79 : 1,038.89 = 438.15 : x
  2. Step 2: Convert to fraction form
    752.79/1,038.89 = 438.15/x
  3. Step 3: Cross multiply
    752.79x = 1,038.89 × 438.15
  4. Step 4: Simplify right side
    752.79x = 455,189.65
  5. Step 5: Solve for x
    x = 455,189.65/752.79
  6. Step 6: Final answer
    x = 604.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.