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Finding the Fourth Proportional to 347.64, 478.96 and 285.48

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Solution

The fourth proportional to 347.64, 478.96 and 285.48 is: 393.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.64 : 478.96 = 285.48 : x
  2. Step 2: Convert to fraction form
    347.64/478.96 = 285.48/x
  3. Step 3: Cross multiply
    347.64x = 478.96 × 285.48
  4. Step 4: Simplify right side
    347.64x = 136,733.50
  5. Step 5: Solve for x
    x = 136,733.50/347.64
  6. Step 6: Final answer
    x = 393.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.