Home / 15,135.72-20,887.40-8,421.63

Finding the Fourth Proportional to 15,135.72, 20,887.40 and 8,421.63

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Solution

The fourth proportional to 15,135.72, 20,887.40 and 8,421.63 is: 11,621.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.72 : 20,887.40 = 8,421.63 : x
  2. Step 2: Convert to fraction form
    15,135.72/20,887.40 = 8,421.63/x
  3. Step 3: Cross multiply
    15,135.72x = 20,887.40 × 8,421.63
  4. Step 4: Simplify right side
    15,135.72x = 175,905,928.14
  5. Step 5: Solve for x
    x = 175,905,928.14/15,135.72
  6. Step 6: Final answer
    x = 11,621.91

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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.