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Finding the Fourth Proportional to 91,785.81, 137,645.08 and 31,798.80

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Solution

The fourth proportional to 91,785.81, 137,645.08 and 31,798.80 is: 47,686.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,785.81 : 137,645.08 = 31,798.80 : x
  2. Step 2: Convert to fraction form
    91,785.81/137,645.08 = 31,798.80/x
  3. Step 3: Cross multiply
    91,785.81x = 137,645.08 × 31,798.80
  4. Step 4: Simplify right side
    91,785.81x = 4,376,947,735.91
  5. Step 5: Solve for x
    x = 4,376,947,735.91/91,785.81
  6. Step 6: Final answer
    x = 47,686.54

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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.