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Finding the Fourth Proportional to 399,374.40, 550,825.12 and 256,145.36

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Solution

The fourth proportional to 399,374.40, 550,825.12 and 256,145.36 is: 353,280.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,374.40 : 550,825.12 = 256,145.36 : x
  2. Step 2: Convert to fraction form
    399,374.40/550,825.12 = 256,145.36/x
  3. Step 3: Cross multiply
    399,374.40x = 550,825.12 × 256,145.36
  4. Step 4: Simplify right side
    399,374.40x = 141,091,298,659.44
  5. Step 5: Solve for x
    x = 141,091,298,659.44/399,374.40
  6. Step 6: Final answer
    x = 353,280.78

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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.