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Finding the Fourth Proportional to 1,246.65, 1,720.44 and 715.62

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Solution

The fourth proportional to 1,246.65, 1,720.44 and 715.62 is: 987.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.65 : 1,720.44 = 715.62 : x
  2. Step 2: Convert to fraction form
    1,246.65/1,720.44 = 715.62/x
  3. Step 3: Cross multiply
    1,246.65x = 1,720.44 × 715.62
  4. Step 4: Simplify right side
    1,246.65x = 1,231,181.27
  5. Step 5: Solve for x
    x = 1,231,181.27/1,246.65
  6. Step 6: Final answer
    x = 987.59

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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.