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Finding the Fourth Proportional to 898.14, 1,240.61 and 662.57

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Solution

The fourth proportional to 898.14, 1,240.61 and 662.57 is: 915.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.14 : 1,240.61 = 662.57 : x
  2. Step 2: Convert to fraction form
    898.14/1,240.61 = 662.57/x
  3. Step 3: Cross multiply
    898.14x = 1,240.61 × 662.57
  4. Step 4: Simplify right side
    898.14x = 821,981.45
  5. Step 5: Solve for x
    x = 821,981.45/898.14
  6. Step 6: Final answer
    x = 915.20

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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.