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Finding the Fourth Proportional to 15,090.40, 20,780.80 and 14,127.72

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Solution

The fourth proportional to 15,090.40, 20,780.80 and 14,127.72 is: 19,455.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,090.40 : 20,780.80 = 14,127.72 : x
  2. Step 2: Convert to fraction form
    15,090.40/20,780.80 = 14,127.72/x
  3. Step 3: Cross multiply
    15,090.40x = 20,780.80 × 14,127.72
  4. Step 4: Simplify right side
    15,090.40x = 293,585,323.78
  5. Step 5: Solve for x
    x = 293,585,323.78/15,090.40
  6. Step 6: Final answer
    x = 19,455.11

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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.