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Finding the Fourth Proportional to 867.18, 1,300.90 and 290

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Solution

The fourth proportional to 867.18, 1,300.90 and 290 is: 435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.18 : 1,300.90 = 290 : x
  2. Step 2: Convert to fraction form
    867.18/1,300.90 = 290/x
  3. Step 3: Cross multiply
    867.18x = 1,300.90 × 290
  4. Step 4: Simplify right side
    867.18x = 377,261
  5. Step 5: Solve for x
    x = 377,261/867.18
  6. Step 6: Final answer
    x = 435.04

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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.