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Finding the Fourth Proportional to 15,090.50, 20,818.42 and 9,118.71

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Solution

The fourth proportional to 15,090.50, 20,818.42 and 9,118.71 is: 12,579.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,090.50 : 20,818.42 = 9,118.71 : x
  2. Step 2: Convert to fraction form
    15,090.50/20,818.42 = 9,118.71/x
  3. Step 3: Cross multiply
    15,090.50x = 20,818.42 × 9,118.71
  4. Step 4: Simplify right side
    15,090.50x = 189,837,111.84
  5. Step 5: Solve for x
    x = 189,837,111.84/15,090.50
  6. Step 6: Final answer
    x = 12,579.91

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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.