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Finding the Fourth Proportional to 898.38, 1,239.81 and 505.41

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Solution

The fourth proportional to 898.38, 1,239.81 and 505.41 is: 697.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.38 : 1,239.81 = 505.41 : x
  2. Step 2: Convert to fraction form
    898.38/1,239.81 = 505.41/x
  3. Step 3: Cross multiply
    898.38x = 1,239.81 × 505.41
  4. Step 4: Simplify right side
    898.38x = 626,612.37
  5. Step 5: Solve for x
    x = 626,612.37/898.38
  6. Step 6: Final answer
    x = 697.49

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Double scale
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1.5x scale

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.