Home / 13,915.20-20,872.80-6,988.08

Finding the Fourth Proportional to 13,915.20, 20,872.80 and 6,988.08

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Solution

The fourth proportional to 13,915.20, 20,872.80 and 6,988.08 is: 10,482.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.20 : 20,872.80 = 6,988.08 : x
  2. Step 2: Convert to fraction form
    13,915.20/20,872.80 = 6,988.08/x
  3. Step 3: Cross multiply
    13,915.20x = 20,872.80 × 6,988.08
  4. Step 4: Simplify right side
    13,915.20x = 145,860,796.22
  5. Step 5: Solve for x
    x = 145,860,796.22/13,915.20
  6. Step 6: Final answer
    x = 10,482.12

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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.