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Finding the Fourth Proportional to 613,439.20, 920,158.80 and 313,820.20

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Solution

The fourth proportional to 613,439.20, 920,158.80 and 313,820.20 is: 470,730.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,439.20 : 920,158.80 = 313,820.20 : x
  2. Step 2: Convert to fraction form
    613,439.20/920,158.80 = 313,820.20/x
  3. Step 3: Cross multiply
    613,439.20x = 920,158.80 × 313,820.20
  4. Step 4: Simplify right side
    613,439.20x = 288,764,418,647.76
  5. Step 5: Solve for x
    x = 288,764,418,647.76/613,439.20
  6. Step 6: Final answer
    x = 470,730.30

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Similar ratio
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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.