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Finding the Fourth Proportional to 153,887.46, 212,371.11 and 85,908.21

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Solution

The fourth proportional to 153,887.46, 212,371.11 and 85,908.21 is: 118,556.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,887.46 : 212,371.11 = 85,908.21 : x
  2. Step 2: Convert to fraction form
    153,887.46/212,371.11 = 85,908.21/x
  3. Step 3: Cross multiply
    153,887.46x = 212,371.11 × 85,908.21
  4. Step 4: Simplify right side
    153,887.46x = 18,244,421,915.81
  5. Step 5: Solve for x
    x = 18,244,421,915.81/153,887.46
  6. Step 6: Final answer
    x = 118,556.91

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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.