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Finding the Fourth Proportional to 402,655.94, 555,651.03 and 221,366.55

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Solution

The fourth proportional to 402,655.94, 555,651.03 and 221,366.55 is: 305,478.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,655.94 : 555,651.03 = 221,366.55 : x
  2. Step 2: Convert to fraction form
    402,655.94/555,651.03 = 221,366.55/x
  3. Step 3: Cross multiply
    402,655.94x = 555,651.03 × 221,366.55
  4. Step 4: Simplify right side
    402,655.94x = 123,002,551,515.05
  5. Step 5: Solve for x
    x = 123,002,551,515.05/402,655.94
  6. Step 6: Final answer
    x = 305,478.05

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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.