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Finding the Fourth Proportional to 1,243.90, 1,715.88 and 719.86

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Solution

The fourth proportional to 1,243.90, 1,715.88 and 719.86 is: 993.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.90 : 1,715.88 = 719.86 : x
  2. Step 2: Convert to fraction form
    1,243.90/1,715.88 = 719.86/x
  3. Step 3: Cross multiply
    1,243.90x = 1,715.88 × 719.86
  4. Step 4: Simplify right side
    1,243.90x = 1,235,193.38
  5. Step 5: Solve for x
    x = 1,235,193.38/1,243.90
  6. Step 6: Final answer
    x = 993.00

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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.