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Finding the Fourth Proportional to 143,920.80, 216,140.40 and 139,255.20

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Solution

The fourth proportional to 143,920.80, 216,140.40 and 139,255.20 is: 209,133.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,920.80 : 216,140.40 = 139,255.20 : x
  2. Step 2: Convert to fraction form
    143,920.80/216,140.40 = 139,255.20/x
  3. Step 3: Cross multiply
    143,920.80x = 216,140.40 × 139,255.20
  4. Step 4: Simplify right side
    143,920.80x = 30,098,674,630.08
  5. Step 5: Solve for x
    x = 30,098,674,630.08/143,920.80
  6. Step 6: Final answer
    x = 209,133.60

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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.