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Finding the Fourth Proportional to 819,559.30, 1,230,337.35 and 520,039.30

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Solution

The fourth proportional to 819,559.30, 1,230,337.35 and 520,039.30 is: 780,692.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,559.30 : 1,230,337.35 = 520,039.30 : x
  2. Step 2: Convert to fraction form
    819,559.30/1,230,337.35 = 520,039.30/x
  3. Step 3: Cross multiply
    819,559.30x = 1,230,337.35 × 520,039.30
  4. Step 4: Simplify right side
    819,559.30x = 639,823,774,257.86
  5. Step 5: Solve for x
    x = 639,823,774,257.86/819,559.30
  6. Step 6: Final answer
    x = 780,692.47

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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.