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Finding the Fourth Proportional to 661,642.40, 992,463.60 and 380,928.80

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Solution

The fourth proportional to 661,642.40, 992,463.60 and 380,928.80 is: 571,393.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,642.40 : 992,463.60 = 380,928.80 : x
  2. Step 2: Convert to fraction form
    661,642.40/992,463.60 = 380,928.80/x
  3. Step 3: Cross multiply
    661,642.40x = 992,463.60 × 380,928.80
  4. Step 4: Simplify right side
    661,642.40x = 378,057,968,191.68
  5. Step 5: Solve for x
    x = 378,057,968,191.68/661,642.40
  6. Step 6: Final answer
    x = 571,393.20

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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.