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Finding the Fourth Proportional to 1,239.98, 1,859.89 and 315.55

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Solution

The fourth proportional to 1,239.98, 1,859.89 and 315.55 is: 473.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.98 : 1,859.89 = 315.55 : x
  2. Step 2: Convert to fraction form
    1,239.98/1,859.89 = 315.55/x
  3. Step 3: Cross multiply
    1,239.98x = 1,859.89 × 315.55
  4. Step 4: Simplify right side
    1,239.98x = 586,879.07
  5. Step 5: Solve for x
    x = 586,879.07/1,239.98
  6. Step 6: Final answer
    x = 473.30

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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.