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Finding the Fourth Proportional to 85,601.72, 128,219.70 and 69,518.77

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Solution

The fourth proportional to 85,601.72, 128,219.70 and 69,518.77 is: 104,129.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,601.72 : 128,219.70 = 69,518.77 : x
  2. Step 2: Convert to fraction form
    85,601.72/128,219.70 = 69,518.77/x
  3. Step 3: Cross multiply
    85,601.72x = 128,219.70 × 69,518.77
  4. Step 4: Simplify right side
    85,601.72x = 8,913,675,833.77
  5. Step 5: Solve for x
    x = 8,913,675,833.77/85,601.72
  6. Step 6: Final answer
    x = 104,129.63

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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.