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Finding the Fourth Proportional to 787.24, 1,085.70 and 565.84

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Solution

The fourth proportional to 787.24, 1,085.70 and 565.84 is: 780.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.24 : 1,085.70 = 565.84 : x
  2. Step 2: Convert to fraction form
    787.24/1,085.70 = 565.84/x
  3. Step 3: Cross multiply
    787.24x = 1,085.70 × 565.84
  4. Step 4: Simplify right side
    787.24x = 614,332.49
  5. Step 5: Solve for x
    x = 614,332.49/787.24
  6. Step 6: Final answer
    x = 780.36

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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.