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Finding the Fourth Proportional to 678,645.40, 1,018,384.10 and 279,477.40

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Solution

The fourth proportional to 678,645.40, 1,018,384.10 and 279,477.40 is: 419,387.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,645.40 : 1,018,384.10 = 279,477.40 : x
  2. Step 2: Convert to fraction form
    678,645.40/1,018,384.10 = 279,477.40/x
  3. Step 3: Cross multiply
    678,645.40x = 1,018,384.10 × 279,477.40
  4. Step 4: Simplify right side
    678,645.40x = 284,615,340,469.34
  5. Step 5: Solve for x
    x = 284,615,340,469.34/678,645.40
  6. Step 6: Final answer
    x = 419,387.42

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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.