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Finding the Fourth Proportional to 1,875.12, 2,811.92 and 778.96

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Solution

The fourth proportional to 1,875.12, 2,811.92 and 778.96 is: 1,168.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.12 : 2,811.92 = 778.96 : x
  2. Step 2: Convert to fraction form
    1,875.12/2,811.92 = 778.96/x
  3. Step 3: Cross multiply
    1,875.12x = 2,811.92 × 778.96
  4. Step 4: Simplify right side
    1,875.12x = 2,190,373.20
  5. Step 5: Solve for x
    x = 2,190,373.20/1,875.12
  6. Step 6: Final answer
    x = 1,168.12

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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.