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Finding the Fourth Proportional to 446.31, 615.70 and 347.40

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Solution

The fourth proportional to 446.31, 615.70 and 347.40 is: 479.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.31 : 615.70 = 347.40 : x
  2. Step 2: Convert to fraction form
    446.31/615.70 = 347.40/x
  3. Step 3: Cross multiply
    446.31x = 615.70 × 347.40
  4. Step 4: Simplify right side
    446.31x = 213,894.18
  5. Step 5: Solve for x
    x = 213,894.18/446.31
  6. Step 6: Final answer
    x = 479.25

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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.