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Finding the Fourth Proportional to 898.56, 1,240.38 and 549.45

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Solution

The fourth proportional to 898.56, 1,240.38 and 549.45 is: 758.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.56 : 1,240.38 = 549.45 : x
  2. Step 2: Convert to fraction form
    898.56/1,240.38 = 549.45/x
  3. Step 3: Cross multiply
    898.56x = 1,240.38 × 549.45
  4. Step 4: Simplify right side
    898.56x = 681,526.79
  5. Step 5: Solve for x
    x = 681,526.79/898.56
  6. Step 6: Final answer
    x = 758.47

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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.