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Finding the Fourth Proportional to 6,659.48, 9,990.66 and 1,979.30

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Solution

The fourth proportional to 6,659.48, 9,990.66 and 1,979.30 is: 2,969.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,659.48 : 9,990.66 = 1,979.30 : x
  2. Step 2: Convert to fraction form
    6,659.48/9,990.66 = 1,979.30/x
  3. Step 3: Cross multiply
    6,659.48x = 9,990.66 × 1,979.30
  4. Step 4: Simplify right side
    6,659.48x = 19,774,513.34
  5. Step 5: Solve for x
    x = 19,774,513.34/6,659.48
  6. Step 6: Final answer
    x = 2,969.38

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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.