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Finding the Fourth Proportional to 644,238.76, 889,886.10 and 490,342

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Solution

The fourth proportional to 644,238.76, 889,886.10 and 490,342 is: 677,308.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,238.76 : 889,886.10 = 490,342 : x
  2. Step 2: Convert to fraction form
    644,238.76/889,886.10 = 490,342/x
  3. Step 3: Cross multiply
    644,238.76x = 889,886.10 × 490,342
  4. Step 4: Simplify right side
    644,238.76x = 436,348,530,046.20
  5. Step 5: Solve for x
    x = 436,348,530,046.20/644,238.76
  6. Step 6: Final answer
    x = 677,308.72

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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.