Home / 140,531.40-210,359.70-81,190.80

Finding the Fourth Proportional to 140,531.40, 210,359.70 and 81,190.80

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Solution

The fourth proportional to 140,531.40, 210,359.70 and 81,190.80 is: 121,533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,531.40 : 210,359.70 = 81,190.80 : x
  2. Step 2: Convert to fraction form
    140,531.40/210,359.70 = 81,190.80/x
  3. Step 3: Cross multiply
    140,531.40x = 210,359.70 × 81,190.80
  4. Step 4: Simplify right side
    140,531.40x = 17,079,272,330.76
  5. Step 5: Solve for x
    x = 17,079,272,330.76/140,531.40
  6. Step 6: Final answer
    x = 121,533.50

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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.