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Finding the Fourth Proportional to 247,145.40, 370,631.70 and 128,777.40

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Solution

The fourth proportional to 247,145.40, 370,631.70 and 128,777.40 is: 193,121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    247,145.40 : 370,631.70 = 128,777.40 : x
  2. Step 2: Convert to fraction form
    247,145.40/370,631.70 = 128,777.40/x
  3. Step 3: Cross multiply
    247,145.40x = 370,631.70 × 128,777.40
  4. Step 4: Simplify right side
    247,145.40x = 47,728,986,683.58
  5. Step 5: Solve for x
    x = 47,728,986,683.58/247,145.40
  6. Step 6: Final answer
    x = 193,121.08

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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.