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Finding the Fourth Proportional to 898.18, 1,239.50 and 505.19

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Solution

The fourth proportional to 898.18, 1,239.50 and 505.19 is: 697.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.18 : 1,239.50 = 505.19 : x
  2. Step 2: Convert to fraction form
    898.18/1,239.50 = 505.19/x
  3. Step 3: Cross multiply
    898.18x = 1,239.50 × 505.19
  4. Step 4: Simplify right side
    898.18x = 626,183.01
  5. Step 5: Solve for x
    x = 626,183.01/898.18
  6. Step 6: Final answer
    x = 697.17

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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.