Home / 39,390.40-54,358.80-21,485.45

Finding the Fourth Proportional to 39,390.40, 54,358.80 and 21,485.45

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Solution

The fourth proportional to 39,390.40, 54,358.80 and 21,485.45 is: 29,649.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,390.40 : 54,358.80 = 21,485.45 : x
  2. Step 2: Convert to fraction form
    39,390.40/54,358.80 = 21,485.45/x
  3. Step 3: Cross multiply
    39,390.40x = 54,358.80 × 21,485.45
  4. Step 4: Simplify right side
    39,390.40x = 1,167,923,334.79
  5. Step 5: Solve for x
    x = 1,167,923,334.79/39,390.40
  6. Step 6: Final answer
    x = 29,649.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.