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Finding the Fourth Proportional to 18,712.80, 28,031.40 and 11,671.20

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Solution

The fourth proportional to 18,712.80, 28,031.40 and 11,671.20 is: 17,483.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.80 : 28,031.40 = 11,671.20 : x
  2. Step 2: Convert to fraction form
    18,712.80/28,031.40 = 11,671.20/x
  3. Step 3: Cross multiply
    18,712.80x = 28,031.40 × 11,671.20
  4. Step 4: Simplify right side
    18,712.80x = 327,160,075.68
  5. Step 5: Solve for x
    x = 327,160,075.68/18,712.80
  6. Step 6: Final answer
    x = 17,483.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.