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Finding the Fourth Proportional to 659,739.60, 989,609.40 and 393,800.40

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Solution

The fourth proportional to 659,739.60, 989,609.40 and 393,800.40 is: 590,700.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,739.60 : 989,609.40 = 393,800.40 : x
  2. Step 2: Convert to fraction form
    659,739.60/989,609.40 = 393,800.40/x
  3. Step 3: Cross multiply
    659,739.60x = 989,609.40 × 393,800.40
  4. Step 4: Simplify right side
    659,739.60x = 389,708,577,563.76
  5. Step 5: Solve for x
    x = 389,708,577,563.76/659,739.60
  6. Step 6: Final answer
    x = 590,700.60

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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.