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Finding the Fourth Proportional to 1,020.58, 1,406.38 and 725.02

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Solution

The fourth proportional to 1,020.58, 1,406.38 and 725.02 is: 999.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.58 : 1,406.38 = 725.02 : x
  2. Step 2: Convert to fraction form
    1,020.58/1,406.38 = 725.02/x
  3. Step 3: Cross multiply
    1,020.58x = 1,406.38 × 725.02
  4. Step 4: Simplify right side
    1,020.58x = 1,019,642.97
  5. Step 5: Solve for x
    x = 1,019,642.97/1,020.58
  6. Step 6: Final answer
    x = 999.09

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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.