Home / 72,140.70-99,554.48-39,435.78

Finding the Fourth Proportional to 72,140.70, 99,554.48 and 39,435.78

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Solution

The fourth proportional to 72,140.70, 99,554.48 and 39,435.78 is: 54,421.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,140.70 : 99,554.48 = 39,435.78 : x
  2. Step 2: Convert to fraction form
    72,140.70/99,554.48 = 39,435.78/x
  3. Step 3: Cross multiply
    72,140.70x = 99,554.48 × 39,435.78
  4. Step 4: Simplify right side
    72,140.70x = 3,926,008,571.29
  5. Step 5: Solve for x
    x = 3,926,008,571.29/72,140.70
  6. Step 6: Final answer
    x = 54,421.55

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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.