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Finding the Fourth Proportional to 890.61, 1,336.07 and 342.84

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Solution

The fourth proportional to 890.61, 1,336.07 and 342.84 is: 514.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.61 : 1,336.07 = 342.84 : x
  2. Step 2: Convert to fraction form
    890.61/1,336.07 = 342.84/x
  3. Step 3: Cross multiply
    890.61x = 1,336.07 × 342.84
  4. Step 4: Simplify right side
    890.61x = 458,058.24
  5. Step 5: Solve for x
    x = 458,058.24/890.61
  6. Step 6: Final answer
    x = 514.32

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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.