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Finding the Fourth Proportional to 143,923.80, 215,885.70 and 91,435.80

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Solution

The fourth proportional to 143,923.80, 215,885.70 and 91,435.80 is: 137,153.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,923.80 : 215,885.70 = 91,435.80 : x
  2. Step 2: Convert to fraction form
    143,923.80/215,885.70 = 91,435.80/x
  3. Step 3: Cross multiply
    143,923.80x = 215,885.70 × 91,435.80
  4. Step 4: Simplify right side
    143,923.80x = 19,739,681,688.06
  5. Step 5: Solve for x
    x = 19,739,681,688.06/143,923.80
  6. Step 6: Final answer
    x = 137,153.70

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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.