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Finding the Fourth Proportional to 1,378.13, 1,901.49 and 818.60

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Solution

The fourth proportional to 1,378.13, 1,901.49 and 818.60 is: 1,129.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.13 : 1,901.49 = 818.60 : x
  2. Step 2: Convert to fraction form
    1,378.13/1,901.49 = 818.60/x
  3. Step 3: Cross multiply
    1,378.13x = 1,901.49 × 818.60
  4. Step 4: Simplify right side
    1,378.13x = 1,556,559.71
  5. Step 5: Solve for x
    x = 1,556,559.71/1,378.13
  6. Step 6: Final answer
    x = 1,129.47

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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.