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Finding the Fourth Proportional to 865.46, 1,192.37 and 644.06

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Solution

The fourth proportional to 865.46, 1,192.37 and 644.06 is: 887.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.46 : 1,192.37 = 644.06 : x
  2. Step 2: Convert to fraction form
    865.46/1,192.37 = 644.06/x
  3. Step 3: Cross multiply
    865.46x = 1,192.37 × 644.06
  4. Step 4: Simplify right side
    865.46x = 767,948.64
  5. Step 5: Solve for x
    x = 767,948.64/865.46
  6. Step 6: Final answer
    x = 887.34

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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.