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Finding the Fourth Proportional to 752.45, 1,128.66 and 570.95

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Solution

The fourth proportional to 752.45, 1,128.66 and 570.95 is: 856.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.45 : 1,128.66 = 570.95 : x
  2. Step 2: Convert to fraction form
    752.45/1,128.66 = 570.95/x
  3. Step 3: Cross multiply
    752.45x = 1,128.66 × 570.95
  4. Step 4: Simplify right side
    752.45x = 644,411.25
  5. Step 5: Solve for x
    x = 644,411.25/752.45
  6. Step 6: Final answer
    x = 856.42

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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.