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Finding the Fourth Proportional to 1,243.35, 1,715.82 and 719.68

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Solution

The fourth proportional to 1,243.35, 1,715.82 and 719.68 is: 993.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.35 : 1,715.82 = 719.68 : x
  2. Step 2: Convert to fraction form
    1,243.35/1,715.82 = 719.68/x
  3. Step 3: Cross multiply
    1,243.35x = 1,715.82 × 719.68
  4. Step 4: Simplify right side
    1,243.35x = 1,234,837.74
  5. Step 5: Solve for x
    x = 1,234,837.74/1,243.35
  6. Step 6: Final answer
    x = 993.16

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1.5x scale

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.