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Finding the Fourth Proportional to 402,680.56, 555,670.56 and 221,387.80

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Solution

The fourth proportional to 402,680.56, 555,670.56 and 221,387.80 is: 305,499.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,680.56 : 555,670.56 = 221,387.80 : x
  2. Step 2: Convert to fraction form
    402,680.56/555,670.56 = 221,387.80/x
  3. Step 3: Cross multiply
    402,680.56x = 555,670.56 × 221,387.80
  4. Step 4: Simplify right side
    402,680.56x = 123,018,682,803.17
  5. Step 5: Solve for x
    x = 123,018,682,803.17/402,680.56
  6. Step 6: Final answer
    x = 305,499.43

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1.5x scale

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.