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Finding the Fourth Proportional to 867.75, 1,308.14 and 854.79

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Solution

The fourth proportional to 867.75, 1,308.14 and 854.79 is: 1,288.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.75 : 1,308.14 = 854.79 : x
  2. Step 2: Convert to fraction form
    867.75/1,308.14 = 854.79/x
  3. Step 3: Cross multiply
    867.75x = 1,308.14 × 854.79
  4. Step 4: Simplify right side
    867.75x = 1,118,184.99
  5. Step 5: Solve for x
    x = 1,118,184.99/867.75
  6. Step 6: Final answer
    x = 1,288.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.