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Finding the Fourth Proportional to 1,291.59, 1,937.79 and 561.65

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Solution

The fourth proportional to 1,291.59, 1,937.79 and 561.65 is: 842.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.59 : 1,937.79 = 561.65 : x
  2. Step 2: Convert to fraction form
    1,291.59/1,937.79 = 561.65/x
  3. Step 3: Cross multiply
    1,291.59x = 1,937.79 × 561.65
  4. Step 4: Simplify right side
    1,291.59x = 1,088,350.06
  5. Step 5: Solve for x
    x = 1,088,350.06/1,291.59
  6. Step 6: Final answer
    x = 842.64

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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.