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Finding the Fourth Proportional to 1,331.78, 1,837.80 and 742.30

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Solution

The fourth proportional to 1,331.78, 1,837.80 and 742.30 is: 1,024.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.78 : 1,837.80 = 742.30 : x
  2. Step 2: Convert to fraction form
    1,331.78/1,837.80 = 742.30/x
  3. Step 3: Cross multiply
    1,331.78x = 1,837.80 × 742.30
  4. Step 4: Simplify right side
    1,331.78x = 1,364,194.35
  5. Step 5: Solve for x
    x = 1,364,194.35/1,331.78
  6. Step 6: Final answer
    x = 1,024.34

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1.5x scale

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.