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Finding the Fourth Proportional to 19,420.71, 29,140.74 and 8,890.71

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Solution

The fourth proportional to 19,420.71, 29,140.74 and 8,890.71 is: 13,340.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,420.71 : 29,140.74 = 8,890.71 : x
  2. Step 2: Convert to fraction form
    19,420.71/29,140.74 = 8,890.71/x
  3. Step 3: Cross multiply
    19,420.71x = 29,140.74 × 8,890.71
  4. Step 4: Simplify right side
    19,420.71x = 259,081,868.53
  5. Step 5: Solve for x
    x = 259,081,868.53/19,420.71
  6. Step 6: Final answer
    x = 13,340.49

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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.