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Finding the Fourth Proportional to 402,679.56, 555,669.18 and 221,386.80

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Solution

The fourth proportional to 402,679.56, 555,669.18 and 221,386.80 is: 305,498.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,679.56 : 555,669.18 = 221,386.80 : x
  2. Step 2: Convert to fraction form
    402,679.56/555,669.18 = 221,386.80/x
  3. Step 3: Cross multiply
    402,679.56x = 555,669.18 × 221,386.80
  4. Step 4: Simplify right side
    402,679.56x = 123,017,821,618.82
  5. Step 5: Solve for x
    x = 123,017,821,618.82/402,679.56
  6. Step 6: Final answer
    x = 305,498.05

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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.