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Finding the Fourth Proportional to 1,712.42, 2,570.26 and 891.28

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Solution

The fourth proportional to 1,712.42, 2,570.26 and 891.28 is: 1,337.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,712.42 : 2,570.26 = 891.28 : x
  2. Step 2: Convert to fraction form
    1,712.42/2,570.26 = 891.28/x
  3. Step 3: Cross multiply
    1,712.42x = 2,570.26 × 891.28
  4. Step 4: Simplify right side
    1,712.42x = 2,290,821.33
  5. Step 5: Solve for x
    x = 2,290,821.33/1,712.42
  6. Step 6: Final answer
    x = 1,337.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.