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Finding the Fourth Proportional to 898.15, 1,240.59 and 687.04

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Solution

The fourth proportional to 898.15, 1,240.59 and 687.04 is: 948.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.15 : 1,240.59 = 687.04 : x
  2. Step 2: Convert to fraction form
    898.15/1,240.59 = 687.04/x
  3. Step 3: Cross multiply
    898.15x = 1,240.59 × 687.04
  4. Step 4: Simplify right side
    898.15x = 852,334.95
  5. Step 5: Solve for x
    x = 852,334.95/898.15
  6. Step 6: Final answer
    x = 948.99

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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.