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Finding the Fourth Proportional to 404,643.60, 606,965.40 and 215,686.80

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Solution

The fourth proportional to 404,643.60, 606,965.40 and 215,686.80 is: 323,530.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    404,643.60 : 606,965.40 = 215,686.80 : x
  2. Step 2: Convert to fraction form
    404,643.60/606,965.40 = 215,686.80/x
  3. Step 3: Cross multiply
    404,643.60x = 606,965.40 × 215,686.80
  4. Step 4: Simplify right side
    404,643.60x = 130,914,424,836.72
  5. Step 5: Solve for x
    x = 130,914,424,836.72/404,643.60
  6. Step 6: Final answer
    x = 323,530.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.