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Finding the Fourth Proportional to 402,766.21, 555,798.33 and 221,485.78

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Solution

The fourth proportional to 402,766.21, 555,798.33 and 221,485.78 is: 305,639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,766.21 : 555,798.33 = 221,485.78 : x
  2. Step 2: Convert to fraction form
    402,766.21/555,798.33 = 221,485.78/x
  3. Step 3: Cross multiply
    402,766.21x = 555,798.33 × 221,485.78
  4. Step 4: Simplify right side
    402,766.21x = 123,101,426,642.75
  5. Step 5: Solve for x
    x = 123,101,426,642.75/402,766.21
  6. Step 6: Final answer
    x = 305,639.91

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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.