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Finding the Fourth Proportional to 720,362.38, 994,103.15 and 393,681.89

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Solution

The fourth proportional to 720,362.38, 994,103.15 and 393,681.89 is: 543,282.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,362.38 : 994,103.15 = 393,681.89 : x
  2. Step 2: Convert to fraction form
    720,362.38/994,103.15 = 393,681.89/x
  3. Step 3: Cross multiply
    720,362.38x = 994,103.15 × 393,681.89
  4. Step 4: Simplify right side
    720,362.38x = 391,360,400,008.03
  5. Step 5: Solve for x
    x = 391,360,400,008.03/720,362.38
  6. Step 6: Final answer
    x = 543,282.67

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.