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Finding the Fourth Proportional to 1,020.68, 1,408.54 and 554.93

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Solution

The fourth proportional to 1,020.68, 1,408.54 and 554.93 is: 765.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.68 : 1,408.54 = 554.93 : x
  2. Step 2: Convert to fraction form
    1,020.68/1,408.54 = 554.93/x
  3. Step 3: Cross multiply
    1,020.68x = 1,408.54 × 554.93
  4. Step 4: Simplify right side
    1,020.68x = 781,641.10
  5. Step 5: Solve for x
    x = 781,641.10/1,020.68
  6. Step 6: Final answer
    x = 765.80

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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.