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Finding the Fourth Proportional to 641,407.18, 885,235.78 and 369,422.76

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Solution

The fourth proportional to 641,407.18, 885,235.78 and 369,422.76 is: 509,857.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,407.18 : 885,235.78 = 369,422.76 : x
  2. Step 2: Convert to fraction form
    641,407.18/885,235.78 = 369,422.76/x
  3. Step 3: Cross multiply
    641,407.18x = 885,235.78 × 369,422.76
  4. Step 4: Simplify right side
    641,407.18x = 327,026,245,098.35
  5. Step 5: Solve for x
    x = 327,026,245,098.35/641,407.18
  6. Step 6: Final answer
    x = 509,857.47

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Double scale
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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.