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Finding the Fourth Proportional to 390,014.80, 585,216.60 and 221,664.40

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Solution

The fourth proportional to 390,014.80, 585,216.60 and 221,664.40 is: 332,607.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,014.80 : 585,216.60 = 221,664.40 : x
  2. Step 2: Convert to fraction form
    390,014.80/585,216.60 = 221,664.40/x
  3. Step 3: Cross multiply
    390,014.80x = 585,216.60 × 221,664.40
  4. Step 4: Simplify right side
    390,014.80x = 129,721,686,509.04
  5. Step 5: Solve for x
    x = 129,721,686,509.04/390,014.80
  6. Step 6: Final answer
    x = 332,607.09

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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.