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Finding the Fourth Proportional to 51,261.80, 76,911.90 and 20,119.40

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Solution

The fourth proportional to 51,261.80, 76,911.90 and 20,119.40 is: 30,186.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,261.80 : 76,911.90 = 20,119.40 : x
  2. Step 2: Convert to fraction form
    51,261.80/76,911.90 = 20,119.40/x
  3. Step 3: Cross multiply
    51,261.80x = 76,911.90 × 20,119.40
  4. Step 4: Simplify right side
    51,261.80x = 1,547,421,280.86
  5. Step 5: Solve for x
    x = 1,547,421,280.86/51,261.80
  6. Step 6: Final answer
    x = 30,186.64

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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.