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Finding the Fourth Proportional to 85,990.60, 128,986.71 and 26,019.55

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Solution

The fourth proportional to 85,990.60, 128,986.71 and 26,019.55 is: 39,029.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,990.60 : 128,986.71 = 26,019.55 : x
  2. Step 2: Convert to fraction form
    85,990.60/128,986.71 = 26,019.55/x
  3. Step 3: Cross multiply
    85,990.60x = 128,986.71 × 26,019.55
  4. Step 4: Simplify right side
    85,990.60x = 3,356,176,150.18
  5. Step 5: Solve for x
    x = 3,356,176,150.18/85,990.60
  6. Step 6: Final answer
    x = 39,029.57

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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.