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Finding the Fourth Proportional to 867.86, 1,300.62 and 319.51

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Solution

The fourth proportional to 867.86, 1,300.62 and 319.51 is: 478.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.86 : 1,300.62 = 319.51 : x
  2. Step 2: Convert to fraction form
    867.86/1,300.62 = 319.51/x
  3. Step 3: Cross multiply
    867.86x = 1,300.62 × 319.51
  4. Step 4: Simplify right side
    867.86x = 415,561.10
  5. Step 5: Solve for x
    x = 415,561.10/867.86
  6. Step 6: Final answer
    x = 478.83

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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.