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Finding the Fourth Proportional to 390,932.69, 539,483.46 and 221,166.81

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Solution

The fourth proportional to 390,932.69, 539,483.46 and 221,166.81 is: 305,208.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,932.69 : 539,483.46 = 221,166.81 : x
  2. Step 2: Convert to fraction form
    390,932.69/539,483.46 = 221,166.81/x
  3. Step 3: Cross multiply
    390,932.69x = 539,483.46 × 221,166.81
  4. Step 4: Simplify right side
    390,932.69x = 119,315,837,797.59
  5. Step 5: Solve for x
    x = 119,315,837,797.59/390,932.69
  6. Step 6: Final answer
    x = 305,208.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.