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Finding the Fourth Proportional to 2,159.66, 3,238.69 and 772.63

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Solution

The fourth proportional to 2,159.66, 3,238.69 and 772.63 is: 1,158.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.66 : 3,238.69 = 772.63 : x
  2. Step 2: Convert to fraction form
    2,159.66/3,238.69 = 772.63/x
  3. Step 3: Cross multiply
    2,159.66x = 3,238.69 × 772.63
  4. Step 4: Simplify right side
    2,159.66x = 2,502,309.05
  5. Step 5: Solve for x
    x = 2,502,309.05/2,159.66
  6. Step 6: Final answer
    x = 1,158.66

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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.