Home / 143,390.40-215,085.60-90,859.20

Finding the Fourth Proportional to 143,390.40, 215,085.60 and 90,859.20

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Solution

The fourth proportional to 143,390.40, 215,085.60 and 90,859.20 is: 136,288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,390.40 : 215,085.60 = 90,859.20 : x
  2. Step 2: Convert to fraction form
    143,390.40/215,085.60 = 90,859.20/x
  3. Step 3: Cross multiply
    143,390.40x = 215,085.60 × 90,859.20
  4. Step 4: Simplify right side
    143,390.40x = 19,542,505,547.52
  5. Step 5: Solve for x
    x = 19,542,505,547.52/143,390.40
  6. Step 6: Final answer
    x = 136,288.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.