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Finding the Fourth Proportional to 139,991.40, 209,987.10 and 87,503.40

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Solution

The fourth proportional to 139,991.40, 209,987.10 and 87,503.40 is: 131,255.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,991.40 : 209,987.10 = 87,503.40 : x
  2. Step 2: Convert to fraction form
    139,991.40/209,987.10 = 87,503.40/x
  3. Step 3: Cross multiply
    139,991.40x = 209,987.10 × 87,503.40
  4. Step 4: Simplify right side
    139,991.40x = 18,374,585,206.14
  5. Step 5: Solve for x
    x = 18,374,585,206.14/139,991.40
  6. Step 6: Final answer
    x = 131,255.10

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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.