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Finding the Fourth Proportional to 85,989.60, 128,985.21 and 26,018.55

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Solution

The fourth proportional to 85,989.60, 128,985.21 and 26,018.55 is: 39,028.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,989.60 : 128,985.21 = 26,018.55 : x
  2. Step 2: Convert to fraction form
    85,989.60/128,985.21 = 26,018.55/x
  3. Step 3: Cross multiply
    85,989.60x = 128,985.21 × 26,018.55
  4. Step 4: Simplify right side
    85,989.60x = 3,356,008,135.65
  5. Step 5: Solve for x
    x = 3,356,008,135.65/85,989.60
  6. Step 6: Final answer
    x = 39,028.07

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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.