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Finding the Fourth Proportional to 143,999.60, 215,999.40 and 139,161.20

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Solution

The fourth proportional to 143,999.60, 215,999.40 and 139,161.20 is: 208,741.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,999.60 : 215,999.40 = 139,161.20 : x
  2. Step 2: Convert to fraction form
    143,999.60/215,999.40 = 139,161.20/x
  3. Step 3: Cross multiply
    143,999.60x = 215,999.40 × 139,161.20
  4. Step 4: Simplify right side
    143,999.60x = 30,058,735,703.28
  5. Step 5: Solve for x
    x = 30,058,735,703.28/143,999.60
  6. Step 6: Final answer
    x = 208,741.80

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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.