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Finding the Fourth Proportional to 399,277.55, 550,994.60 and 217,980.72

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Solution

The fourth proportional to 399,277.55, 550,994.60 and 217,980.72 is: 300,808.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,277.55 : 550,994.60 = 217,980.72 : x
  2. Step 2: Convert to fraction form
    399,277.55/550,994.60 = 217,980.72/x
  3. Step 3: Cross multiply
    399,277.55x = 550,994.60 × 217,980.72
  4. Step 4: Simplify right side
    399,277.55x = 120,106,200,169.06
  5. Step 5: Solve for x
    x = 120,106,200,169.06/399,277.55
  6. Step 6: Final answer
    x = 300,808.80

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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.