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Finding the Fourth Proportional to 561.66, 775.04 and 312.98

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Solution

The fourth proportional to 561.66, 775.04 and 312.98 is: 431.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.66 : 775.04 = 312.98 : x
  2. Step 2: Convert to fraction form
    561.66/775.04 = 312.98/x
  3. Step 3: Cross multiply
    561.66x = 775.04 × 312.98
  4. Step 4: Simplify right side
    561.66x = 242,572.02
  5. Step 5: Solve for x
    x = 242,572.02/561.66
  6. Step 6: Final answer
    x = 431.88

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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.