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Finding the Fourth Proportional to 808.45, 1,113.59 and 571.99

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Solution

The fourth proportional to 808.45, 1,113.59 and 571.99 is: 787.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.45 : 1,113.59 = 571.99 : x
  2. Step 2: Convert to fraction form
    808.45/1,113.59 = 571.99/x
  3. Step 3: Cross multiply
    808.45x = 1,113.59 × 571.99
  4. Step 4: Simplify right side
    808.45x = 636,959.48
  5. Step 5: Solve for x
    x = 636,959.48/808.45
  6. Step 6: Final answer
    x = 787.88

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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.