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Finding the Fourth Proportional to 1,576.71, 2,175.90 and 878.10

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Solution

The fourth proportional to 1,576.71, 2,175.90 and 878.10 is: 1,211.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,576.71 : 2,175.90 = 878.10 : x
  2. Step 2: Convert to fraction form
    1,576.71/2,175.90 = 878.10/x
  3. Step 3: Cross multiply
    1,576.71x = 2,175.90 × 878.10
  4. Step 4: Simplify right side
    1,576.71x = 1,910,657.79
  5. Step 5: Solve for x
    x = 1,910,657.79/1,576.71
  6. Step 6: Final answer
    x = 1,211.80

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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.