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Finding the Fourth Proportional to 19,915.88, 27,485.74 and 10,965.20

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Solution

The fourth proportional to 19,915.88, 27,485.74 and 10,965.20 is: 15,132.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,915.88 : 27,485.74 = 10,965.20 : x
  2. Step 2: Convert to fraction form
    19,915.88/27,485.74 = 10,965.20/x
  3. Step 3: Cross multiply
    19,915.88x = 27,485.74 × 10,965.20
  4. Step 4: Simplify right side
    19,915.88x = 301,386,471.41
  5. Step 5: Solve for x
    x = 301,386,471.41/19,915.88
  6. Step 6: Final answer
    x = 15,132.98

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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.