Home / 15,135.50-20,886.55-8,421.36

Finding the Fourth Proportional to 15,135.50, 20,886.55 and 8,421.36

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Solution

The fourth proportional to 15,135.50, 20,886.55 and 8,421.36 is: 11,621.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.50 : 20,886.55 = 8,421.36 : x
  2. Step 2: Convert to fraction form
    15,135.50/20,886.55 = 8,421.36/x
  3. Step 3: Cross multiply
    15,135.50x = 20,886.55 × 8,421.36
  4. Step 4: Simplify right side
    15,135.50x = 175,893,156.71
  5. Step 5: Solve for x
    x = 175,893,156.71/15,135.50
  6. Step 6: Final answer
    x = 11,621.23

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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.