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Finding the Fourth Proportional to 720,373.36, 1,080,220.88 and 420,940.32

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Solution

The fourth proportional to 720,373.36, 1,080,220.88 and 420,940.32 is: 631,212.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,373.36 : 1,080,220.88 = 420,940.32 : x
  2. Step 2: Convert to fraction form
    720,373.36/1,080,220.88 = 420,940.32/x
  3. Step 3: Cross multiply
    720,373.36x = 1,080,220.88 × 420,940.32
  4. Step 4: Simplify right side
    720,373.36x = 454,708,522,897.88
  5. Step 5: Solve for x
    x = 454,708,522,897.88/720,373.36
  6. Step 6: Final answer
    x = 631,212.30

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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.