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Finding the Fourth Proportional to 347.94, 521.90 and 279.90

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Solution

The fourth proportional to 347.94, 521.90 and 279.90 is: 419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.94 : 521.90 = 279.90 : x
  2. Step 2: Convert to fraction form
    347.94/521.90 = 279.90/x
  3. Step 3: Cross multiply
    347.94x = 521.90 × 279.90
  4. Step 4: Simplify right side
    347.94x = 146,079.81
  5. Step 5: Solve for x
    x = 146,079.81/347.94
  6. Step 6: Final answer
    x = 419.84

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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.