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Finding the Fourth Proportional to 786.09, 1,084.20 and 520.07

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Solution

The fourth proportional to 786.09, 1,084.20 and 520.07 is: 717.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.09 : 1,084.20 = 520.07 : x
  2. Step 2: Convert to fraction form
    786.09/1,084.20 = 520.07/x
  3. Step 3: Cross multiply
    786.09x = 1,084.20 × 520.07
  4. Step 4: Simplify right side
    786.09x = 563,854.47
  5. Step 5: Solve for x
    x = 563,854.47/786.09
  6. Step 6: Final answer
    x = 717.29

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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.