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Finding the Fourth Proportional to 458,619.70, 687,699.15 and 209,019.70

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Solution

The fourth proportional to 458,619.70, 687,699.15 and 209,019.70 is: 313,424.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,619.70 : 687,699.15 = 209,019.70 : x
  2. Step 2: Convert to fraction form
    458,619.70/687,699.15 = 209,019.70/x
  3. Step 3: Cross multiply
    458,619.70x = 687,699.15 × 209,019.70
  4. Step 4: Simplify right side
    458,619.70x = 143,742,670,023.26
  5. Step 5: Solve for x
    x = 143,742,670,023.26/458,619.70
  6. Step 6: Final answer
    x = 313,424.54

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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.