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Finding the Fourth Proportional to 738,389.72, 1,018,978.26 and 398,858.12

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Solution

The fourth proportional to 738,389.72, 1,018,978.26 and 398,858.12 is: 550,424.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,389.72 : 1,018,978.26 = 398,858.12 : x
  2. Step 2: Convert to fraction form
    738,389.72/1,018,978.26 = 398,858.12/x
  3. Step 3: Cross multiply
    738,389.72x = 1,018,978.26 × 398,858.12
  4. Step 4: Simplify right side
    738,389.72x = 406,427,753,104.47
  5. Step 5: Solve for x
    x = 406,427,753,104.47/738,389.72
  6. Step 6: Final answer
    x = 550,424.45

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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.