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Finding the Fourth Proportional to 1,020.58, 1,407.80 and 578.39

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Solution

The fourth proportional to 1,020.58, 1,407.80 and 578.39 is: 797.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.58 : 1,407.80 = 578.39 : x
  2. Step 2: Convert to fraction form
    1,020.58/1,407.80 = 578.39/x
  3. Step 3: Cross multiply
    1,020.58x = 1,407.80 × 578.39
  4. Step 4: Simplify right side
    1,020.58x = 814,251.85
  5. Step 5: Solve for x
    x = 814,251.85/1,020.58
  6. Step 6: Final answer
    x = 797.83

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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.