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Finding the Fourth Proportional to 613,402.65, 920,103.98 and 389,016.45

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Solution

The fourth proportional to 613,402.65, 920,103.98 and 389,016.45 is: 583,524.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,402.65 : 920,103.98 = 389,016.45 : x
  2. Step 2: Convert to fraction form
    613,402.65/920,103.98 = 389,016.45/x
  3. Step 3: Cross multiply
    613,402.65x = 920,103.98 × 389,016.45
  4. Step 4: Simplify right side
    613,402.65x = 357,935,581,985.39
  5. Step 5: Solve for x
    x = 357,935,581,985.39/613,402.65
  6. Step 6: Final answer
    x = 583,524.68

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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.