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Finding the Fourth Proportional to 1,020.15, 1,407.81 and 554.40

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Solution

The fourth proportional to 1,020.15, 1,407.81 and 554.40 is: 765.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.15 : 1,407.81 = 554.40 : x
  2. Step 2: Convert to fraction form
    1,020.15/1,407.81 = 554.40/x
  3. Step 3: Cross multiply
    1,020.15x = 1,407.81 × 554.40
  4. Step 4: Simplify right side
    1,020.15x = 780,484.96
  5. Step 5: Solve for x
    x = 780,484.96/1,020.15
  6. Step 6: Final answer
    x = 765.07

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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.