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Finding the Fourth Proportional to 284.69, 426.60 and 259.40

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Solution

The fourth proportional to 284.69, 426.60 and 259.40 is: 388.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.69 : 426.60 = 259.40 : x
  2. Step 2: Convert to fraction form
    284.69/426.60 = 259.40/x
  3. Step 3: Cross multiply
    284.69x = 426.60 × 259.40
  4. Step 4: Simplify right side
    284.69x = 110,661.11
  5. Step 5: Solve for x
    x = 110,661.11/284.69
  6. Step 6: Final answer
    x = 388.70

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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.