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Finding the Fourth Proportional to 2,159.65, 2,980.18 and 1,215.47

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Solution

The fourth proportional to 2,159.65, 2,980.18 and 1,215.47 is: 1,677.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.65 : 2,980.18 = 1,215.47 : x
  2. Step 2: Convert to fraction form
    2,159.65/2,980.18 = 1,215.47/x
  3. Step 3: Cross multiply
    2,159.65x = 2,980.18 × 1,215.47
  4. Step 4: Simplify right side
    2,159.65x = 3,622,319.38
  5. Step 5: Solve for x
    x = 3,622,319.38/2,159.65
  6. Step 6: Final answer
    x = 1,677.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.