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Finding the Fourth Proportional to 660,536.40, 990,804.60 and 432,213.60

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Solution

The fourth proportional to 660,536.40, 990,804.60 and 432,213.60 is: 648,320.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,536.40 : 990,804.60 = 432,213.60 : x
  2. Step 2: Convert to fraction form
    660,536.40/990,804.60 = 432,213.60/x
  3. Step 3: Cross multiply
    660,536.40x = 990,804.60 × 432,213.60
  4. Step 4: Simplify right side
    660,536.40x = 428,239,223,062.56
  5. Step 5: Solve for x
    x = 428,239,223,062.56/660,536.40
  6. Step 6: Final answer
    x = 648,320.40

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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.