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Finding the Fourth Proportional to 890.39, 1,334.95 and 342.47

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Solution

The fourth proportional to 890.39, 1,334.95 and 342.47 is: 513.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.39 : 1,334.95 = 342.47 : x
  2. Step 2: Convert to fraction form
    890.39/1,334.95 = 342.47/x
  3. Step 3: Cross multiply
    890.39x = 1,334.95 × 342.47
  4. Step 4: Simplify right side
    890.39x = 457,171.94
  5. Step 5: Solve for x
    x = 457,171.94/890.39
  6. Step 6: Final answer
    x = 513.45

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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.