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Finding the Fourth Proportional to 153,885.09, 212,372.10 and 85,915.44

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Solution

The fourth proportional to 153,885.09, 212,372.10 and 85,915.44 is: 118,569.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,885.09 : 212,372.10 = 85,915.44 : x
  2. Step 2: Convert to fraction form
    153,885.09/212,372.10 = 85,915.44/x
  3. Step 3: Cross multiply
    153,885.09x = 212,372.10 × 85,915.44
  4. Step 4: Simplify right side
    153,885.09x = 18,246,042,415.22
  5. Step 5: Solve for x
    x = 18,246,042,415.22/153,885.09
  6. Step 6: Final answer
    x = 118,569.27

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1.5x scale

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.