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Finding the Fourth Proportional to 1,212.45, 1,672.75 and 715.24

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Solution

The fourth proportional to 1,212.45, 1,672.75 and 715.24 is: 986.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.45 : 1,672.75 = 715.24 : x
  2. Step 2: Convert to fraction form
    1,212.45/1,672.75 = 715.24/x
  3. Step 3: Cross multiply
    1,212.45x = 1,672.75 × 715.24
  4. Step 4: Simplify right side
    1,212.45x = 1,196,417.71
  5. Step 5: Solve for x
    x = 1,196,417.71/1,212.45
  6. Step 6: Final answer
    x = 986.78

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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.