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Finding the Fourth Proportional to 672.06, 1,007.28 and 286.50

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Solution

The fourth proportional to 672.06, 1,007.28 and 286.50 is: 429.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.06 : 1,007.28 = 286.50 : x
  2. Step 2: Convert to fraction form
    672.06/1,007.28 = 286.50/x
  3. Step 3: Cross multiply
    672.06x = 1,007.28 × 286.50
  4. Step 4: Simplify right side
    672.06x = 288,585.72
  5. Step 5: Solve for x
    x = 288,585.72/672.06
  6. Step 6: Final answer
    x = 429.40

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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.