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Finding the Fourth Proportional to 1,161.90, 1,602.72 and 940.50

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Solution

The fourth proportional to 1,161.90, 1,602.72 and 940.50 is: 1,297.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.90 : 1,602.72 = 940.50 : x
  2. Step 2: Convert to fraction form
    1,161.90/1,602.72 = 940.50/x
  3. Step 3: Cross multiply
    1,161.90x = 1,602.72 × 940.50
  4. Step 4: Simplify right side
    1,161.90x = 1,507,358.16
  5. Step 5: Solve for x
    x = 1,507,358.16/1,161.90
  6. Step 6: Final answer
    x = 1,297.32

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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.