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Finding the Fourth Proportional to 1,131.74, 1,698.63 and 947.80

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Solution

The fourth proportional to 1,131.74, 1,698.63 and 947.80 is: 1,422.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.74 : 1,698.63 = 947.80 : x
  2. Step 2: Convert to fraction form
    1,131.74/1,698.63 = 947.80/x
  3. Step 3: Cross multiply
    1,131.74x = 1,698.63 × 947.80
  4. Step 4: Simplify right side
    1,131.74x = 1,609,960.08
  5. Step 5: Solve for x
    x = 1,609,960.08/1,131.74
  6. Step 6: Final answer
    x = 1,422.55

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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.