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Finding the Fourth Proportional to 1,217.01, 1,679.56 and 719.63

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Solution

The fourth proportional to 1,217.01, 1,679.56 and 719.63 is: 993.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.01 : 1,679.56 = 719.63 : x
  2. Step 2: Convert to fraction form
    1,217.01/1,679.56 = 719.63/x
  3. Step 3: Cross multiply
    1,217.01x = 1,679.56 × 719.63
  4. Step 4: Simplify right side
    1,217.01x = 1,208,661.76
  5. Step 5: Solve for x
    x = 1,208,661.76/1,217.01
  6. Step 6: Final answer
    x = 993.14

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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.