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Finding the Fourth Proportional to 1,893, 2,611.72 and 1,147.20

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Solution

The fourth proportional to 1,893, 2,611.72 and 1,147.20 is: 1,582.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,893 : 2,611.72 = 1,147.20 : x
  2. Step 2: Convert to fraction form
    1,893/2,611.72 = 1,147.20/x
  3. Step 3: Cross multiply
    1,893x = 2,611.72 × 1,147.20
  4. Step 4: Simplify right side
    1,893x = 2,996,165.18
  5. Step 5: Solve for x
    x = 2,996,165.18/1,893
  6. Step 6: Final answer
    x = 1,582.76

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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.