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Finding the Fourth Proportional to 752.14, 1,038.09 and 490.15

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Solution

The fourth proportional to 752.14, 1,038.09 and 490.15 is: 676.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.14 : 1,038.09 = 490.15 : x
  2. Step 2: Convert to fraction form
    752.14/1,038.09 = 490.15/x
  3. Step 3: Cross multiply
    752.14x = 1,038.09 × 490.15
  4. Step 4: Simplify right side
    752.14x = 508,819.81
  5. Step 5: Solve for x
    x = 508,819.81/752.14
  6. Step 6: Final answer
    x = 676.50

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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.