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Finding the Fourth Proportional to 666,357, 999,639.42 and 216,971.76

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Solution

The fourth proportional to 666,357, 999,639.42 and 216,971.76 is: 325,491.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,357 : 999,639.42 = 216,971.76 : x
  2. Step 2: Convert to fraction form
    666,357/999,639.42 = 216,971.76/x
  3. Step 3: Cross multiply
    666,357x = 999,639.42 × 216,971.76
  4. Step 4: Simplify right side
    666,357x = 216,893,524,322.78
  5. Step 5: Solve for x
    x = 216,893,524,322.78/666,357
  6. Step 6: Final answer
    x = 325,491.48

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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.