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Finding the Fourth Proportional to 206,877.90, 310,608.45 and 128,145.90

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Solution

The fourth proportional to 206,877.90, 310,608.45 and 128,145.90 is: 192,399.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,877.90 : 310,608.45 = 128,145.90 : x
  2. Step 2: Convert to fraction form
    206,877.90/310,608.45 = 128,145.90/x
  3. Step 3: Cross multiply
    206,877.90x = 310,608.45 × 128,145.90
  4. Step 4: Simplify right side
    206,877.90x = 39,803,199,372.86
  5. Step 5: Solve for x
    x = 39,803,199,372.86/206,877.90
  6. Step 6: Final answer
    x = 192,399.48

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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.