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Finding the Fourth Proportional to 85,604.70, 128,416.65 and 26,439.90

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Solution

The fourth proportional to 85,604.70, 128,416.65 and 26,439.90 is: 39,662.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,604.70 : 128,416.65 = 26,439.90 : x
  2. Step 2: Convert to fraction form
    85,604.70/128,416.65 = 26,439.90/x
  3. Step 3: Cross multiply
    85,604.70x = 128,416.65 × 26,439.90
  4. Step 4: Simplify right side
    85,604.70x = 3,395,323,384.34
  5. Step 5: Solve for x
    x = 3,395,323,384.34/85,604.70
  6. Step 6: Final answer
    x = 39,662.82

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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.