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Finding the Fourth Proportional to 842.88, 1,264.24 and 570.72

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Solution

The fourth proportional to 842.88, 1,264.24 and 570.72 is: 856.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.88 : 1,264.24 = 570.72 : x
  2. Step 2: Convert to fraction form
    842.88/1,264.24 = 570.72/x
  3. Step 3: Cross multiply
    842.88x = 1,264.24 × 570.72
  4. Step 4: Simplify right side
    842.88x = 721,527.05
  5. Step 5: Solve for x
    x = 721,527.05/842.88
  6. Step 6: Final answer
    x = 856.03

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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.