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Finding the Fourth Proportional to 551.72, 761.28 and 315.63

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Solution

The fourth proportional to 551.72, 761.28 and 315.63 is: 435.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.72 : 761.28 = 315.63 : x
  2. Step 2: Convert to fraction form
    551.72/761.28 = 315.63/x
  3. Step 3: Cross multiply
    551.72x = 761.28 × 315.63
  4. Step 4: Simplify right side
    551.72x = 240,282.81
  5. Step 5: Solve for x
    x = 240,282.81/551.72
  6. Step 6: Final answer
    x = 435.52

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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.