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Finding the Fourth Proportional to 215.07, 320.40 and 204.74

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Solution

The fourth proportional to 215.07, 320.40 and 204.74 is: 305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.07 : 320.40 = 204.74 : x
  2. Step 2: Convert to fraction form
    215.07/320.40 = 204.74/x
  3. Step 3: Cross multiply
    215.07x = 320.40 × 204.74
  4. Step 4: Simplify right side
    215.07x = 65,598.70
  5. Step 5: Solve for x
    x = 65,598.70/215.07
  6. Step 6: Final answer
    x = 305.01

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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.