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Finding the Fourth Proportional to 438,974.88, 658,395 and 139,416.72

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Solution

The fourth proportional to 438,974.88, 658,395 and 139,416.72 is: 209,103.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,974.88 : 658,395 = 139,416.72 : x
  2. Step 2: Convert to fraction form
    438,974.88/658,395 = 139,416.72/x
  3. Step 3: Cross multiply
    438,974.88x = 658,395 × 139,416.72
  4. Step 4: Simplify right side
    438,974.88x = 91,791,271,364.40
  5. Step 5: Solve for x
    x = 91,791,271,364.40/438,974.88
  6. Step 6: Final answer
    x = 209,103.70

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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.