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Finding the Fourth Proportional to 29,315.34, 43,972.65 and 7,128.72

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Solution

The fourth proportional to 29,315.34, 43,972.65 and 7,128.72 is: 10,692.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,315.34 : 43,972.65 = 7,128.72 : x
  2. Step 2: Convert to fraction form
    29,315.34/43,972.65 = 7,128.72/x
  3. Step 3: Cross multiply
    29,315.34x = 43,972.65 × 7,128.72
  4. Step 4: Simplify right side
    29,315.34x = 313,468,709.51
  5. Step 5: Solve for x
    x = 313,468,709.51/29,315.34
  6. Step 6: Final answer
    x = 10,692.99

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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.