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Finding the Fourth Proportional to 280,245.40, 386,627.56 and 172,628.80

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Solution

The fourth proportional to 280,245.40, 386,627.56 and 172,628.80 is: 238,159.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,245.40 : 386,627.56 = 172,628.80 : x
  2. Step 2: Convert to fraction form
    280,245.40/386,627.56 = 172,628.80/x
  3. Step 3: Cross multiply
    280,245.40x = 386,627.56 × 172,628.80
  4. Step 4: Simplify right side
    280,245.40x = 66,743,051,729.73
  5. Step 5: Solve for x
    x = 66,743,051,729.73/280,245.40
  6. Step 6: Final answer
    x = 238,159.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.