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Finding the Fourth Proportional to 8,607.90, 12,899.70 and 5,311.20

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Solution

The fourth proportional to 8,607.90, 12,899.70 and 5,311.20 is: 7,959.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,607.90 : 12,899.70 = 5,311.20 : x
  2. Step 2: Convert to fraction form
    8,607.90/12,899.70 = 5,311.20/x
  3. Step 3: Cross multiply
    8,607.90x = 12,899.70 × 5,311.20
  4. Step 4: Simplify right side
    8,607.90x = 68,512,886.64
  5. Step 5: Solve for x
    x = 68,512,886.64/8,607.90
  6. Step 6: Final answer
    x = 7,959.30

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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.