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Finding the Fourth Proportional to 986.10, 1,478.80 and 437.30

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Solution

The fourth proportional to 986.10, 1,478.80 and 437.30 is: 655.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.10 : 1,478.80 = 437.30 : x
  2. Step 2: Convert to fraction form
    986.10/1,478.80 = 437.30/x
  3. Step 3: Cross multiply
    986.10x = 1,478.80 × 437.30
  4. Step 4: Simplify right side
    986.10x = 646,679.24
  5. Step 5: Solve for x
    x = 646,679.24/986.10
  6. Step 6: Final answer
    x = 655.79

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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.