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Finding the Fourth Proportional to 551.88, 761.60 and 315.70

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Solution

The fourth proportional to 551.88, 761.60 and 315.70 is: 435.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.88 : 761.60 = 315.70 : x
  2. Step 2: Convert to fraction form
    551.88/761.60 = 315.70/x
  3. Step 3: Cross multiply
    551.88x = 761.60 × 315.70
  4. Step 4: Simplify right side
    551.88x = 240,436.01
  5. Step 5: Solve for x
    x = 240,436.01/551.88
  6. Step 6: Final answer
    x = 435.67

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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.