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Finding the Fourth Proportional to 5,815.90, 8,720.64 and 1,812.20

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Solution

The fourth proportional to 5,815.90, 8,720.64 and 1,812.20 is: 2,717.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,815.90 : 8,720.64 = 1,812.20 : x
  2. Step 2: Convert to fraction form
    5,815.90/8,720.64 = 1,812.20/x
  3. Step 3: Cross multiply
    5,815.90x = 8,720.64 × 1,812.20
  4. Step 4: Simplify right side
    5,815.90x = 15,803,543.81
  5. Step 5: Solve for x
    x = 15,803,543.81/5,815.90
  6. Step 6: Final answer
    x = 2,717.30

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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.