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Finding the Fourth Proportional to 660,573.20, 990,859.80 and 345,645.20

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Solution

The fourth proportional to 660,573.20, 990,859.80 and 345,645.20 is: 518,467.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,573.20 : 990,859.80 = 345,645.20 : x
  2. Step 2: Convert to fraction form
    660,573.20/990,859.80 = 345,645.20/x
  3. Step 3: Cross multiply
    660,573.20x = 990,859.80 × 345,645.20
  4. Step 4: Simplify right side
    660,573.20x = 342,485,933,742.96
  5. Step 5: Solve for x
    x = 342,485,933,742.96/660,573.20
  6. Step 6: Final answer
    x = 518,467.80

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Double scale
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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.