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Finding the Fourth Proportional to 640,999.50, 884,851.66 and 399,401.40

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Solution

The fourth proportional to 640,999.50, 884,851.66 and 399,401.40 is: 551,343.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,999.50 : 884,851.66 = 399,401.40 : x
  2. Step 2: Convert to fraction form
    640,999.50/884,851.66 = 399,401.40/x
  3. Step 3: Cross multiply
    640,999.50x = 884,851.66 × 399,401.40
  4. Step 4: Simplify right side
    640,999.50x = 353,410,991,796.32
  5. Step 5: Solve for x
    x = 353,410,991,796.32/640,999.50
  6. Step 6: Final answer
    x = 551,343.63

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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.