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Finding the Fourth Proportional to 859.16, 1,188.77 and 748.87

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Solution

The fourth proportional to 859.16, 1,188.77 and 748.87 is: 1,036.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.16 : 1,188.77 = 748.87 : x
  2. Step 2: Convert to fraction form
    859.16/1,188.77 = 748.87/x
  3. Step 3: Cross multiply
    859.16x = 1,188.77 × 748.87
  4. Step 4: Simplify right side
    859.16x = 890,224.50
  5. Step 5: Solve for x
    x = 890,224.50/859.16
  6. Step 6: Final answer
    x = 1,036.16

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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.