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Finding the Fourth Proportional to 678,425.88, 936,302.28 and 388,064.28

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Solution

The fourth proportional to 678,425.88, 936,302.28 and 388,064.28 is: 535,571.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,425.88 : 936,302.28 = 388,064.28 : x
  2. Step 2: Convert to fraction form
    678,425.88/936,302.28 = 388,064.28/x
  3. Step 3: Cross multiply
    678,425.88x = 936,302.28 × 388,064.28
  4. Step 4: Simplify right side
    678,425.88x = 363,345,470,150.56
  5. Step 5: Solve for x
    x = 363,345,470,150.56/678,425.88
  6. Step 6: Final answer
    x = 535,571.36

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.