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Finding the Fourth Proportional to 261,989.84, 392,946.42 and 128,834.30

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Solution

The fourth proportional to 261,989.84, 392,946.42 and 128,834.30 is: 193,232.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,989.84 : 392,946.42 = 128,834.30 : x
  2. Step 2: Convert to fraction form
    261,989.84/392,946.42 = 128,834.30/x
  3. Step 3: Cross multiply
    261,989.84x = 392,946.42 × 128,834.30
  4. Step 4: Simplify right side
    261,989.84x = 50,624,976,958.21
  5. Step 5: Solve for x
    x = 50,624,976,958.21/261,989.84
  6. Step 6: Final answer
    x = 193,232.60

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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.