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Finding the Fourth Proportional to 390,139.45, 585,327.13 and 276,507.02

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Solution

The fourth proportional to 390,139.45, 585,327.13 and 276,507.02 is: 414,844.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,139.45 : 585,327.13 = 276,507.02 : x
  2. Step 2: Convert to fraction form
    390,139.45/585,327.13 = 276,507.02/x
  3. Step 3: Cross multiply
    390,139.45x = 585,327.13 × 276,507.02
  4. Step 4: Simplify right side
    390,139.45x = 161,847,061,213.50
  5. Step 5: Solve for x
    x = 161,847,061,213.50/390,139.45
  6. Step 6: Final answer
    x = 414,844.13

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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.