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Finding the Fourth Proportional to 85,846.80, 128,405.70 and 77,025.90

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Solution

The fourth proportional to 85,846.80, 128,405.70 and 77,025.90 is: 115,211.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,846.80 : 128,405.70 = 77,025.90 : x
  2. Step 2: Convert to fraction form
    85,846.80/128,405.70 = 77,025.90/x
  3. Step 3: Cross multiply
    85,846.80x = 128,405.70 × 77,025.90
  4. Step 4: Simplify right side
    85,846.80x = 9,890,564,607.63
  5. Step 5: Solve for x
    x = 9,890,564,607.63/85,846.80
  6. Step 6: Final answer
    x = 115,211.80

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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.