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Finding the Fourth Proportional to 25,419.30, 38,128.95 and 7,890.90

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Solution

The fourth proportional to 25,419.30, 38,128.95 and 7,890.90 is: 11,836.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,419.30 : 38,128.95 = 7,890.90 : x
  2. Step 2: Convert to fraction form
    25,419.30/38,128.95 = 7,890.90/x
  3. Step 3: Cross multiply
    25,419.30x = 38,128.95 × 7,890.90
  4. Step 4: Simplify right side
    25,419.30x = 300,871,731.56
  5. Step 5: Solve for x
    x = 300,871,731.56/25,419.30
  6. Step 6: Final answer
    x = 11,836.35

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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.