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Finding the Fourth Proportional to 390,129.60, 585,194.40 and 109,610.40

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Solution

The fourth proportional to 390,129.60, 585,194.40 and 109,610.40 is: 164,415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,129.60 : 585,194.40 = 109,610.40 : x
  2. Step 2: Convert to fraction form
    390,129.60/585,194.40 = 109,610.40/x
  3. Step 3: Cross multiply
    390,129.60x = 585,194.40 × 109,610.40
  4. Step 4: Simplify right side
    390,129.60x = 64,143,392,261.76
  5. Step 5: Solve for x
    x = 64,143,392,261.76/390,129.60
  6. Step 6: Final answer
    x = 164,415.60

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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.