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Finding the Fourth Proportional to 122,908.20, 172,421.40 and 122,908.20

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Solution

The fourth proportional to 122,908.20, 172,421.40 and 122,908.20 is: 172,421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,908.20 : 172,421.40 = 122,908.20 : x
  2. Step 2: Convert to fraction form
    122,908.20/172,421.40 = 122,908.20/x
  3. Step 3: Cross multiply
    122,908.20x = 172,421.40 × 122,908.20
  4. Step 4: Simplify right side
    122,908.20x = 21,192,003,915.48
  5. Step 5: Solve for x
    x = 21,192,003,915.48/122,908.20
  6. Step 6: Final answer
    x = 172,421.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.