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Finding the Fourth Proportional to 876.24, 1,313.28 and 490.32

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Solution

The fourth proportional to 876.24, 1,313.28 and 490.32 is: 734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.24 : 1,313.28 = 490.32 : x
  2. Step 2: Convert to fraction form
    876.24/1,313.28 = 490.32/x
  3. Step 3: Cross multiply
    876.24x = 1,313.28 × 490.32
  4. Step 4: Simplify right side
    876.24x = 643,927.45
  5. Step 5: Solve for x
    x = 643,927.45/876.24
  6. Step 6: Final answer
    x = 734.88

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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.