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Finding the Fourth Proportional to 1,220.96, 1,684.95 and 723.52

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Solution

The fourth proportional to 1,220.96, 1,684.95 and 723.52 is: 998.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.96 : 1,684.95 = 723.52 : x
  2. Step 2: Convert to fraction form
    1,220.96/1,684.95 = 723.52/x
  3. Step 3: Cross multiply
    1,220.96x = 1,684.95 × 723.52
  4. Step 4: Simplify right side
    1,220.96x = 1,219,089.01
  5. Step 5: Solve for x
    x = 1,219,089.01/1,220.96
  6. Step 6: Final answer
    x = 998.47

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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.