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Finding the Fourth Proportional to 898.77, 1,240.35 and 520.73

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Solution

The fourth proportional to 898.77, 1,240.35 and 520.73 is: 718.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.77 : 1,240.35 = 520.73 : x
  2. Step 2: Convert to fraction form
    898.77/1,240.35 = 520.73/x
  3. Step 3: Cross multiply
    898.77x = 1,240.35 × 520.73
  4. Step 4: Simplify right side
    898.77x = 645,887.46
  5. Step 5: Solve for x
    x = 645,887.46/898.77
  6. Step 6: Final answer
    x = 718.63

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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.