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Finding the Fourth Proportional to 399,360.80, 551,140.40 and 218,089.60

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Solution

The fourth proportional to 399,360.80, 551,140.40 and 218,089.60 is: 300,975.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,360.80 : 551,140.40 = 218,089.60 : x
  2. Step 2: Convert to fraction form
    399,360.80/551,140.40 = 218,089.60/x
  3. Step 3: Cross multiply
    399,360.80x = 551,140.40 × 218,089.60
  4. Step 4: Simplify right side
    399,360.80x = 120,197,989,379.84
  5. Step 5: Solve for x
    x = 120,197,989,379.84/399,360.80
  6. Step 6: Final answer
    x = 300,975.93

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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.