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Finding the Fourth Proportional to 91,559.70, 137,339.55 and 86,019.30

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Solution

The fourth proportional to 91,559.70, 137,339.55 and 86,019.30 is: 129,028.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,559.70 : 137,339.55 = 86,019.30 : x
  2. Step 2: Convert to fraction form
    91,559.70/137,339.55 = 86,019.30/x
  3. Step 3: Cross multiply
    91,559.70x = 137,339.55 × 86,019.30
  4. Step 4: Simplify right side
    91,559.70x = 11,813,851,953.32
  5. Step 5: Solve for x
    x = 11,813,851,953.32/91,559.70
  6. Step 6: Final answer
    x = 129,028.95

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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.