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Finding the Fourth Proportional to 2,926.60, 4,390.02 and 980.20

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Solution

The fourth proportional to 2,926.60, 4,390.02 and 980.20 is: 1,470.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,926.60 : 4,390.02 = 980.20 : x
  2. Step 2: Convert to fraction form
    2,926.60/4,390.02 = 980.20/x
  3. Step 3: Cross multiply
    2,926.60x = 4,390.02 × 980.20
  4. Step 4: Simplify right side
    2,926.60x = 4,303,097.60
  5. Step 5: Solve for x
    x = 4,303,097.60/2,926.60
  6. Step 6: Final answer
    x = 1,470.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.