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Finding the Fourth Proportional to 153,671.34, 212,079.15 and 85,679.13

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Solution

The fourth proportional to 153,671.34, 212,079.15 and 85,679.13 is: 118,244.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,671.34 : 212,079.15 = 85,679.13 : x
  2. Step 2: Convert to fraction form
    153,671.34/212,079.15 = 85,679.13/x
  3. Step 3: Cross multiply
    153,671.34x = 212,079.15 × 85,679.13
  4. Step 4: Simplify right side
    153,671.34x = 18,170,757,063.14
  5. Step 5: Solve for x
    x = 18,170,757,063.14/153,671.34
  6. Step 6: Final answer
    x = 118,244.28

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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.