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Finding the Fourth Proportional to 786.95, 1,085.49 and 621.11

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Solution

The fourth proportional to 786.95, 1,085.49 and 621.11 is: 856.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.95 : 1,085.49 = 621.11 : x
  2. Step 2: Convert to fraction form
    786.95/1,085.49 = 621.11/x
  3. Step 3: Cross multiply
    786.95x = 1,085.49 × 621.11
  4. Step 4: Simplify right side
    786.95x = 674,208.69
  5. Step 5: Solve for x
    x = 674,208.69/786.95
  6. Step 6: Final answer
    x = 856.74

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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.