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Finding the Fourth Proportional to 2,486.70, 3,730.05 and 1,320.30

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Solution

The fourth proportional to 2,486.70, 3,730.05 and 1,320.30 is: 1,980.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,486.70 : 3,730.05 = 1,320.30 : x
  2. Step 2: Convert to fraction form
    2,486.70/3,730.05 = 1,320.30/x
  3. Step 3: Cross multiply
    2,486.70x = 3,730.05 × 1,320.30
  4. Step 4: Simplify right side
    2,486.70x = 4,924,785.02
  5. Step 5: Solve for x
    x = 4,924,785.02/2,486.70
  6. Step 6: Final answer
    x = 1,980.45

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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.