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Finding the Fourth Proportional to 920.88, 1,270.89 and 571.50

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Solution

The fourth proportional to 920.88, 1,270.89 and 571.50 is: 788.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.88 : 1,270.89 = 571.50 : x
  2. Step 2: Convert to fraction form
    920.88/1,270.89 = 571.50/x
  3. Step 3: Cross multiply
    920.88x = 1,270.89 × 571.50
  4. Step 4: Simplify right side
    920.88x = 726,313.64
  5. Step 5: Solve for x
    x = 726,313.64/920.88
  6. Step 6: Final answer
    x = 788.72

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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.