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Finding the Fourth Proportional to 572.11, 856.79 and 543.40

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Solution

The fourth proportional to 572.11, 856.79 and 543.40 is: 813.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.11 : 856.79 = 543.40 : x
  2. Step 2: Convert to fraction form
    572.11/856.79 = 543.40/x
  3. Step 3: Cross multiply
    572.11x = 856.79 × 543.40
  4. Step 4: Simplify right side
    572.11x = 465,574.83
  5. Step 5: Solve for x
    x = 465,574.83/572.11
  6. Step 6: Final answer
    x = 813.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.