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Finding the Fourth Proportional to 684.24, 1,026.60 and 342

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Solution

The fourth proportional to 684.24, 1,026.60 and 342 is: 513.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.24 : 1,026.60 = 342 : x
  2. Step 2: Convert to fraction form
    684.24/1,026.60 = 342/x
  3. Step 3: Cross multiply
    684.24x = 1,026.60 × 342
  4. Step 4: Simplify right side
    684.24x = 351,097.20
  5. Step 5: Solve for x
    x = 351,097.20/684.24
  6. Step 6: Final answer
    x = 513.12

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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.