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Finding the Fourth Proportional to 1,478.98, 2,219.01 and 656.65

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Solution

The fourth proportional to 1,478.98, 2,219.01 and 656.65 is: 985.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.98 : 2,219.01 = 656.65 : x
  2. Step 2: Convert to fraction form
    1,478.98/2,219.01 = 656.65/x
  3. Step 3: Cross multiply
    1,478.98x = 2,219.01 × 656.65
  4. Step 4: Simplify right side
    1,478.98x = 1,457,112.92
  5. Step 5: Solve for x
    x = 1,457,112.92/1,478.98
  6. Step 6: Final answer
    x = 985.21

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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.