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Finding the Fourth Proportional to 1,291.82, 1,937.74 and 859.28

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Solution

The fourth proportional to 1,291.82, 1,937.74 and 859.28 is: 1,288.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.82 : 1,937.74 = 859.28 : x
  2. Step 2: Convert to fraction form
    1,291.82/1,937.74 = 859.28/x
  3. Step 3: Cross multiply
    1,291.82x = 1,937.74 × 859.28
  4. Step 4: Simplify right side
    1,291.82x = 1,665,061.23
  5. Step 5: Solve for x
    x = 1,665,061.23/1,291.82
  6. Step 6: Final answer
    x = 1,288.93

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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.