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Finding the Fourth Proportional to 143,989.92, 198,576.90 and 90,280.80

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Solution

The fourth proportional to 143,989.92, 198,576.90 and 90,280.80 is: 124,506.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,989.92 : 198,576.90 = 90,280.80 : x
  2. Step 2: Convert to fraction form
    143,989.92/198,576.90 = 90,280.80/x
  3. Step 3: Cross multiply
    143,989.92x = 198,576.90 × 90,280.80
  4. Step 4: Simplify right side
    143,989.92x = 17,927,681,393.52
  5. Step 5: Solve for x
    x = 17,927,681,393.52/143,989.92
  6. Step 6: Final answer
    x = 124,506.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.