Home / 139,025.90-208,538.85-86,408.30

Finding the Fourth Proportional to 139,025.90, 208,538.85 and 86,408.30

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Solution

The fourth proportional to 139,025.90, 208,538.85 and 86,408.30 is: 129,612.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,025.90 : 208,538.85 = 86,408.30 : x
  2. Step 2: Convert to fraction form
    139,025.90/208,538.85 = 86,408.30/x
  3. Step 3: Cross multiply
    139,025.90x = 208,538.85 × 86,408.30
  4. Step 4: Simplify right side
    139,025.90x = 18,019,487,512.46
  5. Step 5: Solve for x
    x = 18,019,487,512.46/139,025.90
  6. Step 6: Final answer
    x = 129,612.45

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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.