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Finding the Fourth Proportional to 1,538.76, 2,122.88 and 866.41

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Solution

The fourth proportional to 1,538.76, 2,122.88 and 866.41 is: 1,195.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.76 : 2,122.88 = 866.41 : x
  2. Step 2: Convert to fraction form
    1,538.76/2,122.88 = 866.41/x
  3. Step 3: Cross multiply
    1,538.76x = 2,122.88 × 866.41
  4. Step 4: Simplify right side
    1,538.76x = 1,839,284.46
  5. Step 5: Solve for x
    x = 1,839,284.46/1,538.76
  6. Step 6: Final answer
    x = 1,195.30

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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.