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Finding the Fourth Proportional to 85,424.46, 128,063.77 and 60,385.74

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Solution

The fourth proportional to 85,424.46, 128,063.77 and 60,385.74 is: 90,527.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,424.46 : 128,063.77 = 60,385.74 : x
  2. Step 2: Convert to fraction form
    85,424.46/128,063.77 = 60,385.74/x
  3. Step 3: Cross multiply
    85,424.46x = 128,063.77 × 60,385.74
  4. Step 4: Simplify right side
    85,424.46x = 7,733,224,887.44
  5. Step 5: Solve for x
    x = 7,733,224,887.44/85,424.46
  6. Step 6: Final answer
    x = 90,527.06

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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.