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Finding the Fourth Proportional to 788.20, 1,182.30 and 666.70

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Solution

The fourth proportional to 788.20, 1,182.30 and 666.70 is: 1,000.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.20 : 1,182.30 = 666.70 : x
  2. Step 2: Convert to fraction form
    788.20/1,182.30 = 666.70/x
  3. Step 3: Cross multiply
    788.20x = 1,182.30 × 666.70
  4. Step 4: Simplify right side
    788.20x = 788,239.41
  5. Step 5: Solve for x
    x = 788,239.41/788.20
  6. Step 6: Final answer
    x = 1,000.05

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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.