Home / 100,119.12-138,181.32-57,702.30

Finding the Fourth Proportional to 100,119.12, 138,181.32 and 57,702.30

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Solution

The fourth proportional to 100,119.12, 138,181.32 and 57,702.30 is: 79,638.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,119.12 : 138,181.32 = 57,702.30 : x
  2. Step 2: Convert to fraction form
    100,119.12/138,181.32 = 57,702.30/x
  3. Step 3: Cross multiply
    100,119.12x = 138,181.32 × 57,702.30
  4. Step 4: Simplify right side
    100,119.12x = 7,973,379,981.04
  5. Step 5: Solve for x
    x = 7,973,379,981.04/100,119.12
  6. Step 6: Final answer
    x = 79,638.93

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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.