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Finding the Fourth Proportional to 85,491.40, 128,006.70 and 61,990.60

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Solution

The fourth proportional to 85,491.40, 128,006.70 and 61,990.60 is: 92,818.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,491.40 : 128,006.70 = 61,990.60 : x
  2. Step 2: Convert to fraction form
    85,491.40/128,006.70 = 61,990.60/x
  3. Step 3: Cross multiply
    85,491.40x = 128,006.70 × 61,990.60
  4. Step 4: Simplify right side
    85,491.40x = 7,935,212,137.02
  5. Step 5: Solve for x
    x = 7,935,212,137.02/85,491.40
  6. Step 6: Final answer
    x = 92,818.83

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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.