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Finding the Fourth Proportional to 898.55, 1,239.97 and 505.56

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Solution

The fourth proportional to 898.55, 1,239.97 and 505.56 is: 697.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.55 : 1,239.97 = 505.56 : x
  2. Step 2: Convert to fraction form
    898.55/1,239.97 = 505.56/x
  3. Step 3: Cross multiply
    898.55x = 1,239.97 × 505.56
  4. Step 4: Simplify right side
    898.55x = 626,879.23
  5. Step 5: Solve for x
    x = 626,879.23/898.55
  6. Step 6: Final answer
    x = 697.66

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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.