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Finding the Fourth Proportional to 2,159.74, 3,240.29 and 772.13

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Solution

The fourth proportional to 2,159.74, 3,240.29 and 772.13 is: 1,158.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.74 : 3,240.29 = 772.13 : x
  2. Step 2: Convert to fraction form
    2,159.74/3,240.29 = 772.13/x
  3. Step 3: Cross multiply
    2,159.74x = 3,240.29 × 772.13
  4. Step 4: Simplify right side
    2,159.74x = 2,501,925.12
  5. Step 5: Solve for x
    x = 2,501,925.12/2,159.74
  6. Step 6: Final answer
    x = 1,158.44

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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.