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Finding the Fourth Proportional to 1,426.61, 2,139.89 and 657.11

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Solution

The fourth proportional to 1,426.61, 2,139.89 and 657.11 is: 985.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.61 : 2,139.89 = 657.11 : x
  2. Step 2: Convert to fraction form
    1,426.61/2,139.89 = 657.11/x
  3. Step 3: Cross multiply
    1,426.61x = 2,139.89 × 657.11
  4. Step 4: Simplify right side
    1,426.61x = 1,406,147.65
  5. Step 5: Solve for x
    x = 1,406,147.65/1,426.61
  6. Step 6: Final answer
    x = 985.65

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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.