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Finding the Fourth Proportional to 898.76, 1,240.11 and 689.18

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Solution

The fourth proportional to 898.76, 1,240.11 and 689.18 is: 950.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.76 : 1,240.11 = 689.18 : x
  2. Step 2: Convert to fraction form
    898.76/1,240.11 = 689.18/x
  3. Step 3: Cross multiply
    898.76x = 1,240.11 × 689.18
  4. Step 4: Simplify right side
    898.76x = 854,652.81
  5. Step 5: Solve for x
    x = 854,652.81/898.76
  6. Step 6: Final answer
    x = 950.92

Related Problems

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Half scale
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Double scale
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1.5x scale

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.