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Finding the Fourth Proportional to 3,909.89, 5,864.86 and 988.20

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Solution

The fourth proportional to 3,909.89, 5,864.86 and 988.20 is: 1,482.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.89 : 5,864.86 = 988.20 : x
  2. Step 2: Convert to fraction form
    3,909.89/5,864.86 = 988.20/x
  3. Step 3: Cross multiply
    3,909.89x = 5,864.86 × 988.20
  4. Step 4: Simplify right side
    3,909.89x = 5,795,652.18
  5. Step 5: Solve for x
    x = 5,795,652.18/3,909.89
  6. Step 6: Final answer
    x = 1,482.30

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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.