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Finding the Fourth Proportional to 1,240.42, 1,711.50 and 842.14

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Solution

The fourth proportional to 1,240.42, 1,711.50 and 842.14 is: 1,161.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.42 : 1,711.50 = 842.14 : x
  2. Step 2: Convert to fraction form
    1,240.42/1,711.50 = 842.14/x
  3. Step 3: Cross multiply
    1,240.42x = 1,711.50 × 842.14
  4. Step 4: Simplify right side
    1,240.42x = 1,441,322.61
  5. Step 5: Solve for x
    x = 1,441,322.61/1,240.42
  6. Step 6: Final answer
    x = 1,161.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.