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Finding the Fourth Proportional to 666,081.20, 999,121.80 and 216,844.40

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Solution

The fourth proportional to 666,081.20, 999,121.80 and 216,844.40 is: 325,266.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,081.20 : 999,121.80 = 216,844.40 : x
  2. Step 2: Convert to fraction form
    666,081.20/999,121.80 = 216,844.40/x
  3. Step 3: Cross multiply
    666,081.20x = 999,121.80 × 216,844.40
  4. Step 4: Simplify right side
    666,081.20x = 216,653,967,247.92
  5. Step 5: Solve for x
    x = 216,653,967,247.92/666,081.20
  6. Step 6: Final answer
    x = 325,266.60

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1.5x scale

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.