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Finding the Fourth Proportional to 3,170.40, 4,756.05 and 978.72

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Solution

The fourth proportional to 3,170.40, 4,756.05 and 978.72 is: 1,468.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,170.40 : 4,756.05 = 978.72 : x
  2. Step 2: Convert to fraction form
    3,170.40/4,756.05 = 978.72/x
  3. Step 3: Cross multiply
    3,170.40x = 4,756.05 × 978.72
  4. Step 4: Simplify right side
    3,170.40x = 4,654,841.26
  5. Step 5: Solve for x
    x = 4,654,841.26/3,170.40
  6. Step 6: Final answer
    x = 1,468.22

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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.