Home / 15,278.10-21,055.24-11,915.60

Finding the Fourth Proportional to 15,278.10, 21,055.24 and 11,915.60

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Solution

The fourth proportional to 15,278.10, 21,055.24 and 11,915.60 is: 16,421.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,278.10 : 21,055.24 = 11,915.60 : x
  2. Step 2: Convert to fraction form
    15,278.10/21,055.24 = 11,915.60/x
  3. Step 3: Cross multiply
    15,278.10x = 21,055.24 × 11,915.60
  4. Step 4: Simplify right side
    15,278.10x = 250,885,817.74
  5. Step 5: Solve for x
    x = 250,885,817.74/15,278.10
  6. Step 6: Final answer
    x = 16,421.27

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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.