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Finding the Fourth Proportional to 140,503.40, 210,317.70 and 81,162.80

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Solution

The fourth proportional to 140,503.40, 210,317.70 and 81,162.80 is: 121,491.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,503.40 : 210,317.70 = 81,162.80 : x
  2. Step 2: Convert to fraction form
    140,503.40/210,317.70 = 81,162.80/x
  3. Step 3: Cross multiply
    140,503.40x = 210,317.70 × 81,162.80
  4. Step 4: Simplify right side
    140,503.40x = 17,069,973,421.56
  5. Step 5: Solve for x
    x = 17,069,973,421.56/140,503.40
  6. Step 6: Final answer
    x = 121,491.53

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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.