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Finding the Fourth Proportional to 19,689.90, 29,538.90 and 6,551.70

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Solution

The fourth proportional to 19,689.90, 29,538.90 and 6,551.70 is: 9,828.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,689.90 : 29,538.90 = 6,551.70 : x
  2. Step 2: Convert to fraction form
    19,689.90/29,538.90 = 6,551.70/x
  3. Step 3: Cross multiply
    19,689.90x = 29,538.90 × 6,551.70
  4. Step 4: Simplify right side
    19,689.90x = 193,530,011.13
  5. Step 5: Solve for x
    x = 193,530,011.13/19,689.90
  6. Step 6: Final answer
    x = 9,828.90

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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.