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Finding the Fourth Proportional to 20,429.71, 30,636.65 and 7,948.06

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Solution

The fourth proportional to 20,429.71, 30,636.65 and 7,948.06 is: 11,919.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,429.71 : 30,636.65 = 7,948.06 : x
  2. Step 2: Convert to fraction form
    20,429.71/30,636.65 = 7,948.06/x
  3. Step 3: Cross multiply
    20,429.71x = 30,636.65 × 7,948.06
  4. Step 4: Simplify right side
    20,429.71x = 243,501,875.68
  5. Step 5: Solve for x
    x = 243,501,875.68/20,429.71
  6. Step 6: Final answer
    x = 11,919.01

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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.