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Finding the Fourth Proportional to 287.44, 430.68 and 205

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Solution

The fourth proportional to 287.44, 430.68 and 205 is: 307.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.44 : 430.68 = 205 : x
  2. Step 2: Convert to fraction form
    287.44/430.68 = 205/x
  3. Step 3: Cross multiply
    287.44x = 430.68 × 205
  4. Step 4: Simplify right side
    287.44x = 88,289.40
  5. Step 5: Solve for x
    x = 88,289.40/287.44
  6. Step 6: Final answer
    x = 307.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.