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Finding the Fourth Proportional to 402,436.80, 555,326.64 and 221,146.56

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Solution

The fourth proportional to 402,436.80, 555,326.64 and 221,146.56 is: 305,162.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,436.80 : 555,326.64 = 221,146.56 : x
  2. Step 2: Convert to fraction form
    402,436.80/555,326.64 = 221,146.56/x
  3. Step 3: Cross multiply
    402,436.80x = 555,326.64 × 221,146.56
  4. Step 4: Simplify right side
    402,436.80x = 122,808,576,112.36
  5. Step 5: Solve for x
    x = 122,808,576,112.36/402,436.80
  6. Step 6: Final answer
    x = 305,162.39

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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.