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Finding the Fourth Proportional to 390,309.21, 585,065.01 and 221,472.87

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Solution

The fourth proportional to 390,309.21, 585,065.01 and 221,472.87 is: 331,983.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,309.21 : 585,065.01 = 221,472.87 : x
  2. Step 2: Convert to fraction form
    390,309.21/585,065.01 = 221,472.87/x
  3. Step 3: Cross multiply
    390,309.21x = 585,065.01 × 221,472.87
  4. Step 4: Simplify right side
    390,309.21x = 129,576,026,901.28
  5. Step 5: Solve for x
    x = 129,576,026,901.28/390,309.21
  6. Step 6: Final answer
    x = 331,983.01

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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.