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Finding the Fourth Proportional to 1,986,996.64, 2,979,581.28 and 638,910.40

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Solution

The fourth proportional to 1,986,996.64, 2,979,581.28 and 638,910.40 is: 958,071.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986,996.64 : 2,979,581.28 = 638,910.40 : x
  2. Step 2: Convert to fraction form
    1,986,996.64/2,979,581.28 = 638,910.40/x
  3. Step 3: Cross multiply
    1,986,996.64x = 2,979,581.28 × 638,910.40
  4. Step 4: Simplify right side
    1,986,996.64x = 1,903,685,467,437.31
  5. Step 5: Solve for x
    x = 1,903,685,467,437.31/1,986,996.64
  6. Step 6: Final answer
    x = 958,071.81

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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.