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Finding the Fourth Proportional to 867.19, 1,300.78 and 354.19

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Solution

The fourth proportional to 867.19, 1,300.78 and 354.19 is: 531.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.19 : 1,300.78 = 354.19 : x
  2. Step 2: Convert to fraction form
    867.19/1,300.78 = 354.19/x
  3. Step 3: Cross multiply
    867.19x = 1,300.78 × 354.19
  4. Step 4: Simplify right side
    867.19x = 460,720.90
  5. Step 5: Solve for x
    x = 460,720.90/867.19
  6. Step 6: Final answer
    x = 531.28

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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.