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Finding the Fourth Proportional to 855.16, 1,275.84 and 762.84

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Solution

The fourth proportional to 855.16, 1,275.84 and 762.84 is: 1,138.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.16 : 1,275.84 = 762.84 : x
  2. Step 2: Convert to fraction form
    855.16/1,275.84 = 762.84/x
  3. Step 3: Cross multiply
    855.16x = 1,275.84 × 762.84
  4. Step 4: Simplify right side
    855.16x = 973,261.79
  5. Step 5: Solve for x
    x = 973,261.79/855.16
  6. Step 6: Final answer
    x = 1,138.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.