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Finding the Fourth Proportional to 307,621.40, 429,620.20 and 307,621.40

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Solution

The fourth proportional to 307,621.40, 429,620.20 and 307,621.40 is: 429,620.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,621.40 : 429,620.20 = 307,621.40 : x
  2. Step 2: Convert to fraction form
    307,621.40/429,620.20 = 307,621.40/x
  3. Step 3: Cross multiply
    307,621.40x = 429,620.20 × 307,621.40
  4. Step 4: Simplify right side
    307,621.40x = 132,160,367,392.28
  5. Step 5: Solve for x
    x = 132,160,367,392.28/307,621.40
  6. Step 6: Final answer
    x = 429,620.20

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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.