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Finding the Fourth Proportional to 1,013.08, 1,398.02 and 620.02

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Solution

The fourth proportional to 1,013.08, 1,398.02 and 620.02 is: 855.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.08 : 1,398.02 = 620.02 : x
  2. Step 2: Convert to fraction form
    1,013.08/1,398.02 = 620.02/x
  3. Step 3: Cross multiply
    1,013.08x = 1,398.02 × 620.02
  4. Step 4: Simplify right side
    1,013.08x = 866,800.36
  5. Step 5: Solve for x
    x = 866,800.36/1,013.08
  6. Step 6: Final answer
    x = 855.61

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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.