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Finding the Fourth Proportional to 1,055.71, 1,583.86 and 439.30

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Solution

The fourth proportional to 1,055.71, 1,583.86 and 439.30 is: 659.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.71 : 1,583.86 = 439.30 : x
  2. Step 2: Convert to fraction form
    1,055.71/1,583.86 = 439.30/x
  3. Step 3: Cross multiply
    1,055.71x = 1,583.86 × 439.30
  4. Step 4: Simplify right side
    1,055.71x = 695,789.70
  5. Step 5: Solve for x
    x = 695,789.70/1,055.71
  6. Step 6: Final answer
    x = 659.07

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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.