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Finding the Fourth Proportional to 642,478.39, 963,039.43 and 215,609.48

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Solution

The fourth proportional to 642,478.39, 963,039.43 and 215,609.48 is: 323,186.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,478.39 : 963,039.43 = 215,609.48 : x
  2. Step 2: Convert to fraction form
    642,478.39/963,039.43 = 215,609.48/x
  3. Step 3: Cross multiply
    642,478.39x = 963,039.43 × 215,609.48
  4. Step 4: Simplify right side
    642,478.39x = 207,640,428,574.71
  5. Step 5: Solve for x
    x = 207,640,428,574.71/642,478.39
  6. Step 6: Final answer
    x = 323,186.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.