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Finding the Fourth Proportional to 438,656.79, 658,008.57 and 139,161.32

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Solution

The fourth proportional to 438,656.79, 658,008.57 and 139,161.32 is: 208,749.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,656.79 : 658,008.57 = 139,161.32 : x
  2. Step 2: Convert to fraction form
    438,656.79/658,008.57 = 139,161.32/x
  3. Step 3: Cross multiply
    438,656.79x = 658,008.57 × 139,161.32
  4. Step 4: Simplify right side
    438,656.79x = 91,569,337,882.47
  5. Step 5: Solve for x
    x = 91,569,337,882.47/438,656.79
  6. Step 6: Final answer
    x = 208,749.39

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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.