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Finding the Fourth Proportional to 856.97, 1,290.13 and 584.78

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Solution

The fourth proportional to 856.97, 1,290.13 and 584.78 is: 880.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.97 : 1,290.13 = 584.78 : x
  2. Step 2: Convert to fraction form
    856.97/1,290.13 = 584.78/x
  3. Step 3: Cross multiply
    856.97x = 1,290.13 × 584.78
  4. Step 4: Simplify right side
    856.97x = 754,434.31
  5. Step 5: Solve for x
    x = 754,434.31/856.97
  6. Step 6: Final answer
    x = 880.35

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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.