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Finding the Fourth Proportional to 5,386.80, 8,080.20 and 1,490.88

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Solution

The fourth proportional to 5,386.80, 8,080.20 and 1,490.88 is: 2,236.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,386.80 : 8,080.20 = 1,490.88 : x
  2. Step 2: Convert to fraction form
    5,386.80/8,080.20 = 1,490.88/x
  3. Step 3: Cross multiply
    5,386.80x = 8,080.20 × 1,490.88
  4. Step 4: Simplify right side
    5,386.80x = 12,046,608.58
  5. Step 5: Solve for x
    x = 12,046,608.58/5,386.80
  6. Step 6: Final answer
    x = 2,236.32

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1.5x scale

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.