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Finding the Fourth Proportional to 39,870.90, 59,795.55 and 20,160.90

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Solution

The fourth proportional to 39,870.90, 59,795.55 and 20,160.90 is: 30,235.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,870.90 : 59,795.55 = 20,160.90 : x
  2. Step 2: Convert to fraction form
    39,870.90/59,795.55 = 20,160.90/x
  3. Step 3: Cross multiply
    39,870.90x = 59,795.55 × 20,160.90
  4. Step 4: Simplify right side
    39,870.90x = 1,205,532,104.00
  5. Step 5: Solve for x
    x = 1,205,532,104.00/39,870.90
  6. Step 6: Final answer
    x = 30,235.89

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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.