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Finding the Fourth Proportional to 1,020.88, 1,408.80 and 555.12

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Solution

The fourth proportional to 1,020.88, 1,408.80 and 555.12 is: 766.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.88 : 1,408.80 = 555.12 : x
  2. Step 2: Convert to fraction form
    1,020.88/1,408.80 = 555.12/x
  3. Step 3: Cross multiply
    1,020.88x = 1,408.80 × 555.12
  4. Step 4: Simplify right side
    1,020.88x = 782,053.06
  5. Step 5: Solve for x
    x = 782,053.06/1,020.88
  6. Step 6: Final answer
    x = 766.06

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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.