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Finding the Fourth Proportional to 875.28, 1,313.40 and 490.56

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Solution

The fourth proportional to 875.28, 1,313.40 and 490.56 is: 736.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.28 : 1,313.40 = 490.56 : x
  2. Step 2: Convert to fraction form
    875.28/1,313.40 = 490.56/x
  3. Step 3: Cross multiply
    875.28x = 1,313.40 × 490.56
  4. Step 4: Simplify right side
    875.28x = 644,301.50
  5. Step 5: Solve for x
    x = 644,301.50/875.28
  6. Step 6: Final answer
    x = 736.11

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1.5x scale

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.