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Finding the Fourth Proportional to 346.07, 478.20 and 247.65

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Solution

The fourth proportional to 346.07, 478.20 and 247.65 is: 342.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.07 : 478.20 = 247.65 : x
  2. Step 2: Convert to fraction form
    346.07/478.20 = 247.65/x
  3. Step 3: Cross multiply
    346.07x = 478.20 × 247.65
  4. Step 4: Simplify right side
    346.07x = 118,426.23
  5. Step 5: Solve for x
    x = 118,426.23/346.07
  6. Step 6: Final answer
    x = 342.21

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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.