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Finding the Fourth Proportional to 390,313.04, 585,119.64 and 140,936.72

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Solution

The fourth proportional to 390,313.04, 585,119.64 and 140,936.72 is: 211,278.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,313.04 : 585,119.64 = 140,936.72 : x
  2. Step 2: Convert to fraction form
    390,313.04/585,119.64 = 140,936.72/x
  3. Step 3: Cross multiply
    390,313.04x = 585,119.64 × 140,936.72
  4. Step 4: Simplify right side
    390,313.04x = 82,464,842,869.18
  5. Step 5: Solve for x
    x = 82,464,842,869.18/390,313.04
  6. Step 6: Final answer
    x = 211,278.73

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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.