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Finding the Fourth Proportional to 5,386.76, 8,080.14 and 1,689.28

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Solution

The fourth proportional to 5,386.76, 8,080.14 and 1,689.28 is: 2,533.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,386.76 : 8,080.14 = 1,689.28 : x
  2. Step 2: Convert to fraction form
    5,386.76/8,080.14 = 1,689.28/x
  3. Step 3: Cross multiply
    5,386.76x = 8,080.14 × 1,689.28
  4. Step 4: Simplify right side
    5,386.76x = 13,649,618.90
  5. Step 5: Solve for x
    x = 13,649,618.90/5,386.76
  6. Step 6: Final answer
    x = 2,533.92

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Double scale
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Similar ratio
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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.