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Finding the Fourth Proportional to 867.15, 1,300.59 and 319.20

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Solution

The fourth proportional to 867.15, 1,300.59 and 319.20 is: 478.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.15 : 1,300.59 = 319.20 : x
  2. Step 2: Convert to fraction form
    867.15/1,300.59 = 319.20/x
  3. Step 3: Cross multiply
    867.15x = 1,300.59 × 319.20
  4. Step 4: Simplify right side
    867.15x = 415,152.38
  5. Step 5: Solve for x
    x = 415,152.38/867.15
  6. Step 6: Final answer
    x = 478.76

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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.