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Finding the Fourth Proportional to 885.98, 1,223.22 and 571.40

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Solution

The fourth proportional to 885.98, 1,223.22 and 571.40 is: 788.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.98 : 1,223.22 = 571.40 : x
  2. Step 2: Convert to fraction form
    885.98/1,223.22 = 571.40/x
  3. Step 3: Cross multiply
    885.98x = 1,223.22 × 571.40
  4. Step 4: Simplify right side
    885.98x = 698,947.91
  5. Step 5: Solve for x
    x = 698,947.91/885.98
  6. Step 6: Final answer
    x = 788.90

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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.