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Finding the Fourth Proportional to 780.24, 1,170 and 293.28

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Solution

The fourth proportional to 780.24, 1,170 and 293.28 is: 439.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.24 : 1,170 = 293.28 : x
  2. Step 2: Convert to fraction form
    780.24/1,170 = 293.28/x
  3. Step 3: Cross multiply
    780.24x = 1,170 × 293.28
  4. Step 4: Simplify right side
    780.24x = 343,137.60
  5. Step 5: Solve for x
    x = 343,137.60/780.24
  6. Step 6: Final answer
    x = 439.78

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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.