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Finding the Fourth Proportional to 402,680.74, 555,700.53 and 221,411.20

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Solution

The fourth proportional to 402,680.74, 555,700.53 and 221,411.20 is: 305,548.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,680.74 : 555,700.53 = 221,411.20 : x
  2. Step 2: Convert to fraction form
    402,680.74/555,700.53 = 221,411.20/x
  3. Step 3: Cross multiply
    402,680.74x = 555,700.53 × 221,411.20
  4. Step 4: Simplify right side
    402,680.74x = 123,038,321,187.94
  5. Step 5: Solve for x
    x = 123,038,321,187.94/402,680.74
  6. Step 6: Final answer
    x = 305,548.07

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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.