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Finding the Fourth Proportional to 720,614.70, 994,430.79 and 398,316.51

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Solution

The fourth proportional to 720,614.70, 994,430.79 and 398,316.51 is: 549,667.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,614.70 : 994,430.79 = 398,316.51 : x
  2. Step 2: Convert to fraction form
    720,614.70/994,430.79 = 398,316.51/x
  3. Step 3: Cross multiply
    720,614.70x = 994,430.79 × 398,316.51
  4. Step 4: Simplify right side
    720,614.70x = 396,098,201,709.34
  5. Step 5: Solve for x
    x = 396,098,201,709.34/720,614.70
  6. Step 6: Final answer
    x = 549,667.11

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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.