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Finding the Fourth Proportional to 833.55, 1,250.64 and 285.72

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Solution

The fourth proportional to 833.55, 1,250.64 and 285.72 is: 428.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.55 : 1,250.64 = 285.72 : x
  2. Step 2: Convert to fraction form
    833.55/1,250.64 = 285.72/x
  3. Step 3: Cross multiply
    833.55x = 1,250.64 × 285.72
  4. Step 4: Simplify right side
    833.55x = 357,332.86
  5. Step 5: Solve for x
    x = 357,332.86/833.55
  6. Step 6: Final answer
    x = 428.69

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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.