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Finding the Fourth Proportional to 1,020.33, 1,407.65 and 666.43

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Solution

The fourth proportional to 1,020.33, 1,407.65 and 666.43 is: 919.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.33 : 1,407.65 = 666.43 : x
  2. Step 2: Convert to fraction form
    1,020.33/1,407.65 = 666.43/x
  3. Step 3: Cross multiply
    1,020.33x = 1,407.65 × 666.43
  4. Step 4: Simplify right side
    1,020.33x = 938,093.34
  5. Step 5: Solve for x
    x = 938,093.34/1,020.33
  6. Step 6: Final answer
    x = 919.40

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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.