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Finding the Fourth Proportional to 85,897.29, 128,845.92 and 50,412.60

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Solution

The fourth proportional to 85,897.29, 128,845.92 and 50,412.60 is: 75,618.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,897.29 : 128,845.92 = 50,412.60 : x
  2. Step 2: Convert to fraction form
    85,897.29/128,845.92 = 50,412.60/x
  3. Step 3: Cross multiply
    85,897.29x = 128,845.92 × 50,412.60
  4. Step 4: Simplify right side
    85,897.29x = 6,495,457,826.59
  5. Step 5: Solve for x
    x = 6,495,457,826.59/85,897.29
  6. Step 6: Final answer
    x = 75,618.89

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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.