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Finding the Fourth Proportional to 399,321.74, 551,646.95 and 345,513.34

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Solution

The fourth proportional to 399,321.74, 551,646.95 and 345,513.34 is: 477,312.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,321.74 : 551,646.95 = 345,513.34 : x
  2. Step 2: Convert to fraction form
    399,321.74/551,646.95 = 345,513.34/x
  3. Step 3: Cross multiply
    399,321.74x = 551,646.95 × 345,513.34
  4. Step 4: Simplify right side
    399,321.74x = 190,601,379,679.98
  5. Step 5: Solve for x
    x = 190,601,379,679.98/399,321.74
  6. Step 6: Final answer
    x = 477,312.80

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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.