Home / 15,135.30-20,888.04-8,420.76

Finding the Fourth Proportional to 15,135.30, 20,888.04 and 8,420.76

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Solution

The fourth proportional to 15,135.30, 20,888.04 and 8,420.76 is: 11,621.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.30 : 20,888.04 = 8,420.76 : x
  2. Step 2: Convert to fraction form
    15,135.30/20,888.04 = 8,420.76/x
  3. Step 3: Cross multiply
    15,135.30x = 20,888.04 × 8,420.76
  4. Step 4: Simplify right side
    15,135.30x = 175,893,171.71
  5. Step 5: Solve for x
    x = 175,893,171.71/15,135.30
  6. Step 6: Final answer
    x = 11,621.39

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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.