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Finding the Fourth Proportional to 402,766.30, 555,798.47 and 221,485.87

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Solution

The fourth proportional to 402,766.30, 555,798.47 and 221,485.87 is: 305,640.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,766.30 : 555,798.47 = 221,485.87 : x
  2. Step 2: Convert to fraction form
    402,766.30/555,798.47 = 221,485.87/x
  3. Step 3: Cross multiply
    402,766.30x = 555,798.47 × 221,485.87
  4. Step 4: Simplify right side
    402,766.30x = 123,101,507,672.62
  5. Step 5: Solve for x
    x = 123,101,507,672.62/402,766.30
  6. Step 6: Final answer
    x = 305,640.04

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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.