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Finding the Fourth Proportional to 305,479.76, 421,528.20 and 169,509.20

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Solution

The fourth proportional to 305,479.76, 421,528.20 and 169,509.20 is: 233,903.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,479.76 : 421,528.20 = 169,509.20 : x
  2. Step 2: Convert to fraction form
    305,479.76/421,528.20 = 169,509.20/x
  3. Step 3: Cross multiply
    305,479.76x = 421,528.20 × 169,509.20
  4. Step 4: Simplify right side
    305,479.76x = 71,452,907,959.44
  5. Step 5: Solve for x
    x = 71,452,907,959.44/305,479.76
  6. Step 6: Final answer
    x = 233,903.90

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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.