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Finding the Fourth Proportional to 782.35, 1,173.30 and 288.70

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Solution

The fourth proportional to 782.35, 1,173.30 and 288.70 is: 432.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.35 : 1,173.30 = 288.70 : x
  2. Step 2: Convert to fraction form
    782.35/1,173.30 = 288.70/x
  3. Step 3: Cross multiply
    782.35x = 1,173.30 × 288.70
  4. Step 4: Simplify right side
    782.35x = 338,731.71
  5. Step 5: Solve for x
    x = 338,731.71/782.35
  6. Step 6: Final answer
    x = 432.97

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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.