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Finding the Fourth Proportional to 1,415.78, 1,953.80 and 786.35

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Solution

The fourth proportional to 1,415.78, 1,953.80 and 786.35 is: 1,085.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.78 : 1,953.80 = 786.35 : x
  2. Step 2: Convert to fraction form
    1,415.78/1,953.80 = 786.35/x
  3. Step 3: Cross multiply
    1,415.78x = 1,953.80 × 786.35
  4. Step 4: Simplify right side
    1,415.78x = 1,536,376.74
  5. Step 5: Solve for x
    x = 1,536,376.74/1,415.78
  6. Step 6: Final answer
    x = 1,085.18

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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.