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Finding the Fourth Proportional to 1,223.84, 1,688.90 and 719.58

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Solution

The fourth proportional to 1,223.84, 1,688.90 and 719.58 is: 993.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.84 : 1,688.90 = 719.58 : x
  2. Step 2: Convert to fraction form
    1,223.84/1,688.90 = 719.58/x
  3. Step 3: Cross multiply
    1,223.84x = 1,688.90 × 719.58
  4. Step 4: Simplify right side
    1,223.84x = 1,215,298.66
  5. Step 5: Solve for x
    x = 1,215,298.66/1,223.84
  6. Step 6: Final answer
    x = 993.02

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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.