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Finding the Fourth Proportional to 660,000.60, 990,000.90 and 390,562.20

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Solution

The fourth proportional to 660,000.60, 990,000.90 and 390,562.20 is: 585,843.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,000.60 : 990,000.90 = 390,562.20 : x
  2. Step 2: Convert to fraction form
    660,000.60/990,000.90 = 390,562.20/x
  3. Step 3: Cross multiply
    660,000.60x = 990,000.90 × 390,562.20
  4. Step 4: Simplify right side
    660,000.60x = 386,656,929,505.98
  5. Step 5: Solve for x
    x = 386,656,929,505.98/660,000.60
  6. Step 6: Final answer
    x = 585,843.30

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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.