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Finding the Fourth Proportional to 838.91, 1,259.10 and 400.70

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Solution

The fourth proportional to 838.91, 1,259.10 and 400.70 is: 601.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.91 : 1,259.10 = 400.70 : x
  2. Step 2: Convert to fraction form
    838.91/1,259.10 = 400.70/x
  3. Step 3: Cross multiply
    838.91x = 1,259.10 × 400.70
  4. Step 4: Simplify right side
    838.91x = 504,515.07
  5. Step 5: Solve for x
    x = 504,515.07/838.91
  6. Step 6: Final answer
    x = 601.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.