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Finding the Fourth Proportional to 123,306.40, 184,959.60 and 85,981.60

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Solution

The fourth proportional to 123,306.40, 184,959.60 and 85,981.60 is: 128,972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,306.40 : 184,959.60 = 85,981.60 : x
  2. Step 2: Convert to fraction form
    123,306.40/184,959.60 = 85,981.60/x
  3. Step 3: Cross multiply
    123,306.40x = 184,959.60 × 85,981.60
  4. Step 4: Simplify right side
    123,306.40x = 15,903,122,343.36
  5. Step 5: Solve for x
    x = 15,903,122,343.36/123,306.40
  6. Step 6: Final answer
    x = 128,972.40

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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.