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Finding the Fourth Proportional to 25,420, 35,079.60 and 15,484

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Solution

The fourth proportional to 25,420, 35,079.60 and 15,484 is: 21,367.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,420 : 35,079.60 = 15,484 : x
  2. Step 2: Convert to fraction form
    25,420/35,079.60 = 15,484/x
  3. Step 3: Cross multiply
    25,420x = 35,079.60 × 15,484
  4. Step 4: Simplify right side
    25,420x = 543,172,526.40
  5. Step 5: Solve for x
    x = 543,172,526.40/25,420
  6. Step 6: Final answer
    x = 21,367.92

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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.