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Finding the Fourth Proportional to 19,969.68, 29,946.96 and 6,640.20

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Solution

The fourth proportional to 19,969.68, 29,946.96 and 6,640.20 is: 9,957.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,969.68 : 29,946.96 = 6,640.20 : x
  2. Step 2: Convert to fraction form
    19,969.68/29,946.96 = 6,640.20/x
  3. Step 3: Cross multiply
    19,969.68x = 29,946.96 × 6,640.20
  4. Step 4: Simplify right side
    19,969.68x = 198,853,803.79
  5. Step 5: Solve for x
    x = 198,853,803.79/19,969.68
  6. Step 6: Final answer
    x = 9,957.79

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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.