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Finding the Fourth Proportional to 1,257.59, 1,734.10 and 859.30

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Solution

The fourth proportional to 1,257.59, 1,734.10 and 859.30 is: 1,184.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.59 : 1,734.10 = 859.30 : x
  2. Step 2: Convert to fraction form
    1,257.59/1,734.10 = 859.30/x
  3. Step 3: Cross multiply
    1,257.59x = 1,734.10 × 859.30
  4. Step 4: Simplify right side
    1,257.59x = 1,490,112.13
  5. Step 5: Solve for x
    x = 1,490,112.13/1,257.59
  6. Step 6: Final answer
    x = 1,184.90

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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.