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Finding the Fourth Proportional to 438,993.18, 658,421.12 and 139,434.32

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Solution

The fourth proportional to 438,993.18, 658,421.12 and 139,434.32 is: 209,129.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,993.18 : 658,421.12 = 139,434.32 : x
  2. Step 2: Convert to fraction form
    438,993.18/658,421.12 = 139,434.32/x
  3. Step 3: Cross multiply
    438,993.18x = 658,421.12 × 139,434.32
  4. Step 4: Simplify right side
    438,993.18x = 91,806,503,135.48
  5. Step 5: Solve for x
    x = 91,806,503,135.48/438,993.18
  6. Step 6: Final answer
    x = 209,129.68

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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.