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Finding the Fourth Proportional to 620,602.80, 930,904.20 and 439,519.20

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Solution

The fourth proportional to 620,602.80, 930,904.20 and 439,519.20 is: 659,278.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,602.80 : 930,904.20 = 439,519.20 : x
  2. Step 2: Convert to fraction form
    620,602.80/930,904.20 = 439,519.20/x
  3. Step 3: Cross multiply
    620,602.80x = 930,904.20 × 439,519.20
  4. Step 4: Simplify right side
    620,602.80x = 409,150,269,260.64
  5. Step 5: Solve for x
    x = 409,150,269,260.64/620,602.80
  6. Step 6: Final answer
    x = 659,278.80

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Double scale
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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.