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Finding the Fourth Proportional to 928.59, 1,390.72 and 562.72

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Solution

The fourth proportional to 928.59, 1,390.72 and 562.72 is: 842.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.59 : 1,390.72 = 562.72 : x
  2. Step 2: Convert to fraction form
    928.59/1,390.72 = 562.72/x
  3. Step 3: Cross multiply
    928.59x = 1,390.72 × 562.72
  4. Step 4: Simplify right side
    928.59x = 782,588.65
  5. Step 5: Solve for x
    x = 782,588.65/928.59
  6. Step 6: Final answer
    x = 842.77

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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.