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Finding the Fourth Proportional to 845.72, 1,267.90 and 498.20

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Solution

The fourth proportional to 845.72, 1,267.90 and 498.20 is: 746.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.72 : 1,267.90 = 498.20 : x
  2. Step 2: Convert to fraction form
    845.72/1,267.90 = 498.20/x
  3. Step 3: Cross multiply
    845.72x = 1,267.90 × 498.20
  4. Step 4: Simplify right side
    845.72x = 631,667.78
  5. Step 5: Solve for x
    x = 631,667.78/845.72
  6. Step 6: Final answer
    x = 746.90

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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.