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Finding the Fourth Proportional to 685,492.80, 946,095.21 and 399,181.70

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Solution

The fourth proportional to 685,492.80, 946,095.21 and 399,181.70 is: 550,937.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,492.80 : 946,095.21 = 399,181.70 : x
  2. Step 2: Convert to fraction form
    685,492.80/946,095.21 = 399,181.70/x
  3. Step 3: Cross multiply
    685,492.80x = 946,095.21 × 399,181.70
  4. Step 4: Simplify right side
    685,492.80x = 377,663,894,289.66
  5. Step 5: Solve for x
    x = 377,663,894,289.66/685,492.80
  6. Step 6: Final answer
    x = 550,937.80

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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.