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Finding the Fourth Proportional to 1,088.68, 1,632.08 and 780.88

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Solution

The fourth proportional to 1,088.68, 1,632.08 and 780.88 is: 1,170.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.68 : 1,632.08 = 780.88 : x
  2. Step 2: Convert to fraction form
    1,088.68/1,632.08 = 780.88/x
  3. Step 3: Cross multiply
    1,088.68x = 1,632.08 × 780.88
  4. Step 4: Simplify right side
    1,088.68x = 1,274,454.73
  5. Step 5: Solve for x
    x = 1,274,454.73/1,088.68
  6. Step 6: Final answer
    x = 1,170.64

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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.