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Finding the Fourth Proportional to 286.72, 430.55 and 265.40

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Solution

The fourth proportional to 286.72, 430.55 and 265.40 is: 398.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.72 : 430.55 = 265.40 : x
  2. Step 2: Convert to fraction form
    286.72/430.55 = 265.40/x
  3. Step 3: Cross multiply
    286.72x = 430.55 × 265.40
  4. Step 4: Simplify right side
    286.72x = 114,267.10
  5. Step 5: Solve for x
    x = 114,267.10/286.72
  6. Step 6: Final answer
    x = 398.54

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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.