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Finding the Fourth Proportional to 898.57, 1,240.14 and 505.67

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Solution

The fourth proportional to 898.57, 1,240.14 and 505.67 is: 697.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.57 : 1,240.14 = 505.67 : x
  2. Step 2: Convert to fraction form
    898.57/1,240.14 = 505.67/x
  3. Step 3: Cross multiply
    898.57x = 1,240.14 × 505.67
  4. Step 4: Simplify right side
    898.57x = 627,104.27
  5. Step 5: Solve for x
    x = 627,104.27/898.57
  6. Step 6: Final answer
    x = 697.89

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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.