Home / 39,720.13-54,814.16-21,815.50

Finding the Fourth Proportional to 39,720.13, 54,814.16 and 21,815.50

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Solution

The fourth proportional to 39,720.13, 54,814.16 and 21,815.50 is: 30,105.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.13 : 54,814.16 = 21,815.50 : x
  2. Step 2: Convert to fraction form
    39,720.13/54,814.16 = 21,815.50/x
  3. Step 3: Cross multiply
    39,720.13x = 54,814.16 × 21,815.50
  4. Step 4: Simplify right side
    39,720.13x = 1,195,798,307.48
  5. Step 5: Solve for x
    x = 1,195,798,307.48/39,720.13
  6. Step 6: Final answer
    x = 30,105.60

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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.