Home / 644,933.34-890,091.99-390,288.78

Finding the Fourth Proportional to 644,933.34, 890,091.99 and 390,288.78

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Solution

The fourth proportional to 644,933.34, 890,091.99 and 390,288.78 is: 538,649.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,933.34 : 890,091.99 = 390,288.78 : x
  2. Step 2: Convert to fraction form
    644,933.34/890,091.99 = 390,288.78/x
  3. Step 3: Cross multiply
    644,933.34x = 890,091.99 × 390,288.78
  4. Step 4: Simplify right side
    644,933.34x = 347,392,916,864.87
  5. Step 5: Solve for x
    x = 347,392,916,864.87/644,933.34
  6. Step 6: Final answer
    x = 538,649.34

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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.