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Finding the Fourth Proportional to 914.86, 1,261.41 and 715.18

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Solution

The fourth proportional to 914.86, 1,261.41 and 715.18 is: 986.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.86 : 1,261.41 = 715.18 : x
  2. Step 2: Convert to fraction form
    914.86/1,261.41 = 715.18/x
  3. Step 3: Cross multiply
    914.86x = 1,261.41 × 715.18
  4. Step 4: Simplify right side
    914.86x = 902,135.20
  5. Step 5: Solve for x
    x = 902,135.20/914.86
  6. Step 6: Final answer
    x = 986.09

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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.