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Finding the Fourth Proportional to 678,858.12, 936,720.10 and 392,322.90

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Solution

The fourth proportional to 678,858.12, 936,720.10 and 392,322.90 is: 541,345.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,858.12 : 936,720.10 = 392,322.90 : x
  2. Step 2: Convert to fraction form
    678,858.12/936,720.10 = 392,322.90/x
  3. Step 3: Cross multiply
    678,858.12x = 936,720.10 × 392,322.90
  4. Step 4: Simplify right side
    678,858.12x = 367,496,746,120.29
  5. Step 5: Solve for x
    x = 367,496,746,120.29/678,858.12
  6. Step 6: Final answer
    x = 541,345.44

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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.