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Finding the Fourth Proportional to 875.88, 1,311.30 and 788.40

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Solution

The fourth proportional to 875.88, 1,311.30 and 788.40 is: 1,180.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.88 : 1,311.30 = 788.40 : x
  2. Step 2: Convert to fraction form
    875.88/1,311.30 = 788.40/x
  3. Step 3: Cross multiply
    875.88x = 1,311.30 × 788.40
  4. Step 4: Simplify right side
    875.88x = 1,033,828.92
  5. Step 5: Solve for x
    x = 1,033,828.92/875.88
  6. Step 6: Final answer
    x = 1,180.33

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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.