Home / 39,120.21-53,985.83-21,215.18

Finding the Fourth Proportional to 39,120.21, 53,985.83 and 21,215.18

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Solution

The fourth proportional to 39,120.21, 53,985.83 and 21,215.18 is: 29,276.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,120.21 : 53,985.83 = 21,215.18 : x
  2. Step 2: Convert to fraction form
    39,120.21/53,985.83 = 21,215.18/x
  3. Step 3: Cross multiply
    39,120.21x = 53,985.83 × 21,215.18
  4. Step 4: Simplify right side
    39,120.21x = 1,145,318,724.89
  5. Step 5: Solve for x
    x = 1,145,318,724.89/39,120.21
  6. Step 6: Final answer
    x = 29,276.91

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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.