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Finding the Fourth Proportional to 611,315.39, 915,780.21 and 400,313.63

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Solution

The fourth proportional to 611,315.39, 915,780.21 and 400,313.63 is: 599,689.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,315.39 : 915,780.21 = 400,313.63 : x
  2. Step 2: Convert to fraction form
    611,315.39/915,780.21 = 400,313.63/x
  3. Step 3: Cross multiply
    611,315.39x = 915,780.21 × 400,313.63
  4. Step 4: Simplify right side
    611,315.39x = 366,599,295,568.36
  5. Step 5: Solve for x
    x = 366,599,295,568.36/611,315.39
  6. Step 6: Final answer
    x = 599,689.30

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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.