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Finding the Fourth Proportional to 1,019.88, 1,407.43 and 554.14

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Solution

The fourth proportional to 1,019.88, 1,407.43 and 554.14 is: 764.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.88 : 1,407.43 = 554.14 : x
  2. Step 2: Convert to fraction form
    1,019.88/1,407.43 = 554.14/x
  3. Step 3: Cross multiply
    1,019.88x = 1,407.43 × 554.14
  4. Step 4: Simplify right side
    1,019.88x = 779,913.26
  5. Step 5: Solve for x
    x = 779,913.26/1,019.88
  6. Step 6: Final answer
    x = 764.71

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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.