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Finding the Fourth Proportional to 898.50, 1,239.96 and 549.12

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Solution

The fourth proportional to 898.50, 1,239.96 and 549.12 is: 757.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.50 : 1,239.96 = 549.12 : x
  2. Step 2: Convert to fraction form
    898.50/1,239.96 = 549.12/x
  3. Step 3: Cross multiply
    898.50x = 1,239.96 × 549.12
  4. Step 4: Simplify right side
    898.50x = 680,886.84
  5. Step 5: Solve for x
    x = 680,886.84/898.50
  6. Step 6: Final answer
    x = 757.80

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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.