Home / 39,423.80-59,145.16-13,128.78

Finding the Fourth Proportional to 39,423.80, 59,145.16 and 13,128.78

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Solution

The fourth proportional to 39,423.80, 59,145.16 and 13,128.78 is: 19,696.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,423.80 : 59,145.16 = 13,128.78 : x
  2. Step 2: Convert to fraction form
    39,423.80/59,145.16 = 13,128.78/x
  3. Step 3: Cross multiply
    39,423.80x = 59,145.16 × 13,128.78
  4. Step 4: Simplify right side
    39,423.80x = 776,503,793.70
  5. Step 5: Solve for x
    x = 776,503,793.70/39,423.80
  6. Step 6: Final answer
    x = 19,696.32

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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.