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Finding the Fourth Proportional to 639,409.80, 882,406.90 and 349,038.60

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Solution

The fourth proportional to 639,409.80, 882,406.90 and 349,038.60 is: 481,684.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,409.80 : 882,406.90 = 349,038.60 : x
  2. Step 2: Convert to fraction form
    639,409.80/882,406.90 = 349,038.60/x
  3. Step 3: Cross multiply
    639,409.80x = 882,406.90 × 349,038.60
  4. Step 4: Simplify right side
    639,409.80x = 307,994,069,006.34
  5. Step 5: Solve for x
    x = 307,994,069,006.34/639,409.80
  6. Step 6: Final answer
    x = 481,684.94

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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.