Home / 25,775.40-38,640.60-9,991.20

Finding the Fourth Proportional to 25,775.40, 38,640.60 and 9,991.20

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Solution

The fourth proportional to 25,775.40, 38,640.60 and 9,991.20 is: 14,978.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,775.40 : 38,640.60 = 9,991.20 : x
  2. Step 2: Convert to fraction form
    25,775.40/38,640.60 = 9,991.20/x
  3. Step 3: Cross multiply
    25,775.40x = 38,640.60 × 9,991.20
  4. Step 4: Simplify right side
    25,775.40x = 386,065,962.72
  5. Step 5: Solve for x
    x = 386,065,962.72/25,775.40
  6. Step 6: Final answer
    x = 14,978.08

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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.