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Finding the Fourth Proportional to 143,391.90, 215,087.85 and 90,860.70

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Solution

The fourth proportional to 143,391.90, 215,087.85 and 90,860.70 is: 136,291.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,391.90 : 215,087.85 = 90,860.70 : x
  2. Step 2: Convert to fraction form
    143,391.90/215,087.85 = 90,860.70/x
  3. Step 3: Cross multiply
    143,391.90x = 215,087.85 × 90,860.70
  4. Step 4: Simplify right side
    143,391.90x = 19,543,032,612.50
  5. Step 5: Solve for x
    x = 19,543,032,612.50/143,391.90
  6. Step 6: Final answer
    x = 136,291.05

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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.