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Finding the Fourth Proportional to 1,039.07, 1,559.06 and 807.61

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Solution

The fourth proportional to 1,039.07, 1,559.06 and 807.61 is: 1,211.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.07 : 1,559.06 = 807.61 : x
  2. Step 2: Convert to fraction form
    1,039.07/1,559.06 = 807.61/x
  3. Step 3: Cross multiply
    1,039.07x = 1,559.06 × 807.61
  4. Step 4: Simplify right side
    1,039.07x = 1,259,118.36
  5. Step 5: Solve for x
    x = 1,259,118.36/1,039.07
  6. Step 6: Final answer
    x = 1,211.77

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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.