Home / 20,138.10-30,207.15-12,702.30

Finding the Fourth Proportional to 20,138.10, 30,207.15 and 12,702.30

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Solution

The fourth proportional to 20,138.10, 30,207.15 and 12,702.30 is: 19,053.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.10 : 30,207.15 = 12,702.30 : x
  2. Step 2: Convert to fraction form
    20,138.10/30,207.15 = 12,702.30/x
  3. Step 3: Cross multiply
    20,138.10x = 30,207.15 × 12,702.30
  4. Step 4: Simplify right side
    20,138.10x = 383,700,281.45
  5. Step 5: Solve for x
    x = 383,700,281.45/20,138.10
  6. Step 6: Final answer
    x = 19,053.45

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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.