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Finding the Fourth Proportional to 678,657.80, 1,018,101.90 and 205,339.40

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Solution

The fourth proportional to 678,657.80, 1,018,101.90 and 205,339.40 is: 308,043.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,657.80 : 1,018,101.90 = 205,339.40 : x
  2. Step 2: Convert to fraction form
    678,657.80/1,018,101.90 = 205,339.40/x
  3. Step 3: Cross multiply
    678,657.80x = 1,018,101.90 × 205,339.40
  4. Step 4: Simplify right side
    678,657.80x = 209,056,433,284.86
  5. Step 5: Solve for x
    x = 209,056,433,284.86/678,657.80
  6. Step 6: Final answer
    x = 308,043.96

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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.