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Finding the Fourth Proportional to 143,140.40, 214,710.60 and 90,609.20

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Solution

The fourth proportional to 143,140.40, 214,710.60 and 90,609.20 is: 135,913.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,140.40 : 214,710.60 = 90,609.20 : x
  2. Step 2: Convert to fraction form
    143,140.40/214,710.60 = 90,609.20/x
  3. Step 3: Cross multiply
    143,140.40x = 214,710.60 × 90,609.20
  4. Step 4: Simplify right side
    143,140.40x = 19,454,755,697.52
  5. Step 5: Solve for x
    x = 19,454,755,697.52/143,140.40
  6. Step 6: Final answer
    x = 135,913.80

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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.