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Finding the Fourth Proportional to 85,411.59, 128,031.62 and 29,213.28

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Solution

The fourth proportional to 85,411.59, 128,031.62 and 29,213.28 is: 43,790.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,411.59 : 128,031.62 = 29,213.28 : x
  2. Step 2: Convert to fraction form
    85,411.59/128,031.62 = 29,213.28/x
  3. Step 3: Cross multiply
    85,411.59x = 128,031.62 × 29,213.28
  4. Step 4: Simplify right side
    85,411.59x = 3,740,223,563.91
  5. Step 5: Solve for x
    x = 3,740,223,563.91/85,411.59
  6. Step 6: Final answer
    x = 43,790.59

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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.