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Finding the Fourth Proportional to 1,305.58, 1,959 and 575.78

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Solution

The fourth proportional to 1,305.58, 1,959 and 575.78 is: 863.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.58 : 1,959 = 575.78 : x
  2. Step 2: Convert to fraction form
    1,305.58/1,959 = 575.78/x
  3. Step 3: Cross multiply
    1,305.58x = 1,959 × 575.78
  4. Step 4: Simplify right side
    1,305.58x = 1,127,953.02
  5. Step 5: Solve for x
    x = 1,127,953.02/1,305.58
  6. Step 6: Final answer
    x = 863.95

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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.