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Finding the Fourth Proportional to 1,415.83, 1,953.79 and 786.39

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Solution

The fourth proportional to 1,415.83, 1,953.79 and 786.39 is: 1,085.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.83 : 1,953.79 = 786.39 : x
  2. Step 2: Convert to fraction form
    1,415.83/1,953.79 = 786.39/x
  3. Step 3: Cross multiply
    1,415.83x = 1,953.79 × 786.39
  4. Step 4: Simplify right side
    1,415.83x = 1,536,440.92
  5. Step 5: Solve for x
    x = 1,536,440.92/1,415.83
  6. Step 6: Final answer
    x = 1,085.19

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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.