Home / 153,758.28-212,181.60-90,138.45

Finding the Fourth Proportional to 153,758.28, 212,181.60 and 90,138.45

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Solution

The fourth proportional to 153,758.28, 212,181.60 and 90,138.45 is: 124,388.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,758.28 : 212,181.60 = 90,138.45 : x
  2. Step 2: Convert to fraction form
    153,758.28/212,181.60 = 90,138.45/x
  3. Step 3: Cross multiply
    153,758.28x = 212,181.60 × 90,138.45
  4. Step 4: Simplify right side
    153,758.28x = 19,125,720,542.52
  5. Step 5: Solve for x
    x = 19,125,720,542.52/153,758.28
  6. Step 6: Final answer
    x = 124,388.23

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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.