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Finding the Fourth Proportional to 1,426.78, 2,141.10 and 647.20

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Solution

The fourth proportional to 1,426.78, 2,141.10 and 647.20 is: 971.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.78 : 2,141.10 = 647.20 : x
  2. Step 2: Convert to fraction form
    1,426.78/2,141.10 = 647.20/x
  3. Step 3: Cross multiply
    1,426.78x = 2,141.10 × 647.20
  4. Step 4: Simplify right side
    1,426.78x = 1,385,719.92
  5. Step 5: Solve for x
    x = 1,385,719.92/1,426.78
  6. Step 6: Final answer
    x = 971.22

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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.