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Finding the Fourth Proportional to 5,312.63, 7,969.90 and 2,190.90

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Solution

The fourth proportional to 5,312.63, 7,969.90 and 2,190.90 is: 3,286.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,312.63 : 7,969.90 = 2,190.90 : x
  2. Step 2: Convert to fraction form
    5,312.63/7,969.90 = 2,190.90/x
  3. Step 3: Cross multiply
    5,312.63x = 7,969.90 × 2,190.90
  4. Step 4: Simplify right side
    5,312.63x = 17,461,253.91
  5. Step 5: Solve for x
    x = 17,461,253.91/5,312.63
  6. Step 6: Final answer
    x = 3,286.74

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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.