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Finding the Fourth Proportional to 402,887.69, 555,986.12 and 221,618.19

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Solution

The fourth proportional to 402,887.69, 555,986.12 and 221,618.19 is: 305,833.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,887.69 : 555,986.12 = 221,618.19 : x
  2. Step 2: Convert to fraction form
    402,887.69/555,986.12 = 221,618.19/x
  3. Step 3: Cross multiply
    402,887.69x = 555,986.12 × 221,618.19
  4. Step 4: Simplify right side
    402,887.69x = 123,216,637,579.52
  5. Step 5: Solve for x
    x = 123,216,637,579.52/402,887.69
  6. Step 6: Final answer
    x = 305,833.71

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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.