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Finding the Fourth Proportional to 660,156.80, 990,235.20 and 423,766.40

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Solution

The fourth proportional to 660,156.80, 990,235.20 and 423,766.40 is: 635,649.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,156.80 : 990,235.20 = 423,766.40 : x
  2. Step 2: Convert to fraction form
    660,156.80/990,235.20 = 423,766.40/x
  3. Step 3: Cross multiply
    660,156.80x = 990,235.20 × 423,766.40
  4. Step 4: Simplify right side
    660,156.80x = 419,628,405,857.28
  5. Step 5: Solve for x
    x = 419,628,405,857.28/660,156.80
  6. Step 6: Final answer
    x = 635,649.60

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Similar ratio
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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.