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Finding the Fourth Proportional to 141,871.70, 212,432.10 and 85,636.64

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Solution

The fourth proportional to 141,871.70, 212,432.10 and 85,636.64 is: 128,228.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,871.70 : 212,432.10 = 85,636.64 : x
  2. Step 2: Convert to fraction form
    141,871.70/212,432.10 = 85,636.64/x
  3. Step 3: Cross multiply
    141,871.70x = 212,432.10 × 85,636.64
  4. Step 4: Simplify right side
    141,871.70x = 18,191,971,272.14
  5. Step 5: Solve for x
    x = 18,191,971,272.14/141,871.70
  6. Step 6: Final answer
    x = 128,228.33

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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.