Home / 10,515.02-15,781.72-4,278.44

Finding the Fourth Proportional to 10,515.02, 15,781.72 and 4,278.44

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Solution

The fourth proportional to 10,515.02, 15,781.72 and 4,278.44 is: 6,421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,515.02 : 15,781.72 = 4,278.44 : x
  2. Step 2: Convert to fraction form
    10,515.02/15,781.72 = 4,278.44/x
  3. Step 3: Cross multiply
    10,515.02x = 15,781.72 × 4,278.44
  4. Step 4: Simplify right side
    10,515.02x = 67,521,142.12
  5. Step 5: Solve for x
    x = 67,521,142.12/10,515.02
  6. Step 6: Final answer
    x = 6,421.40

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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.