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Finding the Fourth Proportional to 846.72, 1,269.74 and 319.52

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Solution

The fourth proportional to 846.72, 1,269.74 and 319.52 is: 479.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.72 : 1,269.74 = 319.52 : x
  2. Step 2: Convert to fraction form
    846.72/1,269.74 = 319.52/x
  3. Step 3: Cross multiply
    846.72x = 1,269.74 × 319.52
  4. Step 4: Simplify right side
    846.72x = 405,707.32
  5. Step 5: Solve for x
    x = 405,707.32/846.72
  6. Step 6: Final answer
    x = 479.15

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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.