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Finding the Fourth Proportional to 284.48, 392.40 and 186.40

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Solution

The fourth proportional to 284.48, 392.40 and 186.40 is: 257.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.48 : 392.40 = 186.40 : x
  2. Step 2: Convert to fraction form
    284.48/392.40 = 186.40/x
  3. Step 3: Cross multiply
    284.48x = 392.40 × 186.40
  4. Step 4: Simplify right side
    284.48x = 73,143.36
  5. Step 5: Solve for x
    x = 73,143.36/284.48
  6. Step 6: Final answer
    x = 257.11

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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.