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Finding the Fourth Proportional to 785.36, 1,084.17 and 491.06

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Solution

The fourth proportional to 785.36, 1,084.17 and 491.06 is: 677.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.36 : 1,084.17 = 491.06 : x
  2. Step 2: Convert to fraction form
    785.36/1,084.17 = 491.06/x
  3. Step 3: Cross multiply
    785.36x = 1,084.17 × 491.06
  4. Step 4: Simplify right side
    785.36x = 532,392.52
  5. Step 5: Solve for x
    x = 532,392.52/785.36
  6. Step 6: Final answer
    x = 677.90

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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.