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Finding the Fourth Proportional to 137,953.80, 206,930.70 and 90,714.60

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Solution

The fourth proportional to 137,953.80, 206,930.70 and 90,714.60 is: 136,071.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,953.80 : 206,930.70 = 90,714.60 : x
  2. Step 2: Convert to fraction form
    137,953.80/206,930.70 = 90,714.60/x
  3. Step 3: Cross multiply
    137,953.80x = 206,930.70 × 90,714.60
  4. Step 4: Simplify right side
    137,953.80x = 18,771,635,678.22
  5. Step 5: Solve for x
    x = 18,771,635,678.22/137,953.80
  6. Step 6: Final answer
    x = 136,071.90

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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.