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Finding the Fourth Proportional to 1,415.51, 1,953.47 and 786.11

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Solution

The fourth proportional to 1,415.51, 1,953.47 and 786.11 is: 1,084.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.51 : 1,953.47 = 786.11 : x
  2. Step 2: Convert to fraction form
    1,415.51/1,953.47 = 786.11/x
  3. Step 3: Cross multiply
    1,415.51x = 1,953.47 × 786.11
  4. Step 4: Simplify right side
    1,415.51x = 1,535,628.60
  5. Step 5: Solve for x
    x = 1,535,628.60/1,415.51
  6. Step 6: Final answer
    x = 1,084.86

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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.