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Finding the Fourth Proportional to 1,117.79, 1,539.67 and 940.53

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Solution

The fourth proportional to 1,117.79, 1,539.67 and 940.53 is: 1,295.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.79 : 1,539.67 = 940.53 : x
  2. Step 2: Convert to fraction form
    1,117.79/1,539.67 = 940.53/x
  3. Step 3: Cross multiply
    1,117.79x = 1,539.67 × 940.53
  4. Step 4: Simplify right side
    1,117.79x = 1,448,105.83
  5. Step 5: Solve for x
    x = 1,448,105.83/1,117.79
  6. Step 6: Final answer
    x = 1,295.51

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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.