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Finding the Fourth Proportional to 914.86, 1,360.63 and 891.79

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Solution

The fourth proportional to 914.86, 1,360.63 and 891.79 is: 1,326.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.86 : 1,360.63 = 891.79 : x
  2. Step 2: Convert to fraction form
    914.86/1,360.63 = 891.79/x
  3. Step 3: Cross multiply
    914.86x = 1,360.63 × 891.79
  4. Step 4: Simplify right side
    914.86x = 1,213,391.77
  5. Step 5: Solve for x
    x = 1,213,391.77/914.86
  6. Step 6: Final answer
    x = 1,326.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.