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Finding the Fourth Proportional to 898.26, 1,239.60 and 505.28

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Solution

The fourth proportional to 898.26, 1,239.60 and 505.28 is: 697.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.26 : 1,239.60 = 505.28 : x
  2. Step 2: Convert to fraction form
    898.26/1,239.60 = 505.28/x
  3. Step 3: Cross multiply
    898.26x = 1,239.60 × 505.28
  4. Step 4: Simplify right side
    898.26x = 626,345.09
  5. Step 5: Solve for x
    x = 626,345.09/898.26
  6. Step 6: Final answer
    x = 697.29

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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.