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Finding the Fourth Proportional to 1,415.89, 1,953.95 and 856.26

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Solution

The fourth proportional to 1,415.89, 1,953.95 and 856.26 is: 1,181.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.89 : 1,953.95 = 856.26 : x
  2. Step 2: Convert to fraction form
    1,415.89/1,953.95 = 856.26/x
  3. Step 3: Cross multiply
    1,415.89x = 1,953.95 × 856.26
  4. Step 4: Simplify right side
    1,415.89x = 1,673,084.95
  5. Step 5: Solve for x
    x = 1,673,084.95/1,415.89
  6. Step 6: Final answer
    x = 1,181.65

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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.