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Finding the Fourth Proportional to 787.48, 1,085.94 and 621.36

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Solution

The fourth proportional to 787.48, 1,085.94 and 621.36 is: 856.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.48 : 1,085.94 = 621.36 : x
  2. Step 2: Convert to fraction form
    787.48/1,085.94 = 621.36/x
  3. Step 3: Cross multiply
    787.48x = 1,085.94 × 621.36
  4. Step 4: Simplify right side
    787.48x = 674,759.68
  5. Step 5: Solve for x
    x = 674,759.68/787.48
  6. Step 6: Final answer
    x = 856.86

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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.