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Finding the Fourth Proportional to 572.19, 856.77 and 455.86

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Solution

The fourth proportional to 572.19, 856.77 and 455.86 is: 682.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.19 : 856.77 = 455.86 : x
  2. Step 2: Convert to fraction form
    572.19/856.77 = 455.86/x
  3. Step 3: Cross multiply
    572.19x = 856.77 × 455.86
  4. Step 4: Simplify right side
    572.19x = 390,560.61
  5. Step 5: Solve for x
    x = 390,560.61/572.19
  6. Step 6: Final answer
    x = 682.57

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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.