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Finding the Fourth Proportional to 85,541.60, 128,166.60 and 73,002.80

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Solution

The fourth proportional to 85,541.60, 128,166.60 and 73,002.80 is: 109,379.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,541.60 : 128,166.60 = 73,002.80 : x
  2. Step 2: Convert to fraction form
    85,541.60/128,166.60 = 73,002.80/x
  3. Step 3: Cross multiply
    85,541.60x = 128,166.60 × 73,002.80
  4. Step 4: Simplify right side
    85,541.60x = 9,356,520,666.48
  5. Step 5: Solve for x
    x = 9,356,520,666.48/85,541.60
  6. Step 6: Final answer
    x = 109,379.77

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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.