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Finding the Fourth Proportional to 1,587, 2,191.68 and 1,576.20

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Solution

The fourth proportional to 1,587, 2,191.68 and 1,576.20 is: 2,176.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587 : 2,191.68 = 1,576.20 : x
  2. Step 2: Convert to fraction form
    1,587/2,191.68 = 1,576.20/x
  3. Step 3: Cross multiply
    1,587x = 2,191.68 × 1,576.20
  4. Step 4: Simplify right side
    1,587x = 3,454,526.02
  5. Step 5: Solve for x
    x = 3,454,526.02/1,587
  6. Step 6: Final answer
    x = 2,176.76

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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.