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Finding the Fourth Proportional to 399,155.64, 550,643.76 and 270,139.20

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Solution

The fourth proportional to 399,155.64, 550,643.76 and 270,139.20 is: 372,662.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,155.64 : 550,643.76 = 270,139.20 : x
  2. Step 2: Convert to fraction form
    399,155.64/550,643.76 = 270,139.20/x
  3. Step 3: Cross multiply
    399,155.64x = 550,643.76 × 270,139.20
  4. Step 4: Simplify right side
    399,155.64x = 148,750,464,811.39
  5. Step 5: Solve for x
    x = 148,750,464,811.39/399,155.64
  6. Step 6: Final answer
    x = 372,662.82

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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.