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Finding the Fourth Proportional to 641,672.28, 885,497 and 355,186.20

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Solution

The fourth proportional to 641,672.28, 885,497 and 355,186.20 is: 490,151.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,672.28 : 885,497 = 355,186.20 : x
  2. Step 2: Convert to fraction form
    641,672.28/885,497 = 355,186.20/x
  3. Step 3: Cross multiply
    641,672.28x = 885,497 × 355,186.20
  4. Step 4: Simplify right side
    641,672.28x = 314,516,314,541.40
  5. Step 5: Solve for x
    x = 314,516,314,541.40/641,672.28
  6. Step 6: Final answer
    x = 490,151.01

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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.