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Finding the Fourth Proportional to 671.77, 1,007.66 and 286.75

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Solution

The fourth proportional to 671.77, 1,007.66 and 286.75 is: 430.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.77 : 1,007.66 = 286.75 : x
  2. Step 2: Convert to fraction form
    671.77/1,007.66 = 286.75/x
  3. Step 3: Cross multiply
    671.77x = 1,007.66 × 286.75
  4. Step 4: Simplify right side
    671.77x = 288,946.51
  5. Step 5: Solve for x
    x = 288,946.51/671.77
  6. Step 6: Final answer
    x = 430.13

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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.