Home / 15,135.89-20,886.93-8,421.80

Finding the Fourth Proportional to 15,135.89, 20,886.93 and 8,421.80

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Solution

The fourth proportional to 15,135.89, 20,886.93 and 8,421.80 is: 11,621.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.89 : 20,886.93 = 8,421.80 : x
  2. Step 2: Convert to fraction form
    15,135.89/20,886.93 = 8,421.80/x
  3. Step 3: Cross multiply
    15,135.89x = 20,886.93 × 8,421.80
  4. Step 4: Simplify right side
    15,135.89x = 175,905,442.64
  5. Step 5: Solve for x
    x = 175,905,442.64/15,135.89
  6. Step 6: Final answer
    x = 11,621.75

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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.