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Finding the Fourth Proportional to 898.45, 1,239.89 and 505.47

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Solution

The fourth proportional to 898.45, 1,239.89 and 505.47 is: 697.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.45 : 1,239.89 = 505.47 : x
  2. Step 2: Convert to fraction form
    898.45/1,239.89 = 505.47/x
  3. Step 3: Cross multiply
    898.45x = 1,239.89 × 505.47
  4. Step 4: Simplify right side
    898.45x = 626,722.26
  5. Step 5: Solve for x
    x = 626,722.26/898.45
  6. Step 6: Final answer
    x = 697.56

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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.