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Finding the Fourth Proportional to 1,570.55, 2,166.62 and 940.78

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Solution

The fourth proportional to 1,570.55, 2,166.62 and 940.78 is: 1,297.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.55 : 2,166.62 = 940.78 : x
  2. Step 2: Convert to fraction form
    1,570.55/2,166.62 = 940.78/x
  3. Step 3: Cross multiply
    1,570.55x = 2,166.62 × 940.78
  4. Step 4: Simplify right side
    1,570.55x = 2,038,309.70
  5. Step 5: Solve for x
    x = 2,038,309.70/1,570.55
  6. Step 6: Final answer
    x = 1,297.83

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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.