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Finding the Fourth Proportional to 693,103.80, 1,039,655.70 and 319,855.80

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Solution

The fourth proportional to 693,103.80, 1,039,655.70 and 319,855.80 is: 479,783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    693,103.80 : 1,039,655.70 = 319,855.80 : x
  2. Step 2: Convert to fraction form
    693,103.80/1,039,655.70 = 319,855.80/x
  3. Step 3: Cross multiply
    693,103.80x = 1,039,655.70 × 319,855.80
  4. Step 4: Simplify right side
    693,103.80x = 332,539,905,648.06
  5. Step 5: Solve for x
    x = 332,539,905,648.06/693,103.80
  6. Step 6: Final answer
    x = 479,783.70

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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.