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Finding the Fourth Proportional to 875.91, 1,315.20 and 847.86

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Solution

The fourth proportional to 875.91, 1,315.20 and 847.86 is: 1,273.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.91 : 1,315.20 = 847.86 : x
  2. Step 2: Convert to fraction form
    875.91/1,315.20 = 847.86/x
  3. Step 3: Cross multiply
    875.91x = 1,315.20 × 847.86
  4. Step 4: Simplify right side
    875.91x = 1,115,105.47
  5. Step 5: Solve for x
    x = 1,115,105.47/875.91
  6. Step 6: Final answer
    x = 1,273.08

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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.