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Finding the Fourth Proportional to 287.16, 428.65 and 265.74

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Solution

The fourth proportional to 287.16, 428.65 and 265.74 is: 396.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.16 : 428.65 = 265.74 : x
  2. Step 2: Convert to fraction form
    287.16/428.65 = 265.74/x
  3. Step 3: Cross multiply
    287.16x = 428.65 × 265.74
  4. Step 4: Simplify right side
    287.16x = 113,911.35
  5. Step 5: Solve for x
    x = 113,911.35/287.16
  6. Step 6: Final answer
    x = 396.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.