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Finding the Fourth Proportional to 914.79, 1,262.19 and 665.70

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Solution

The fourth proportional to 914.79, 1,262.19 and 665.70 is: 918.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.79 : 1,262.19 = 665.70 : x
  2. Step 2: Convert to fraction form
    914.79/1,262.19 = 665.70/x
  3. Step 3: Cross multiply
    914.79x = 1,262.19 × 665.70
  4. Step 4: Simplify right side
    914.79x = 840,239.88
  5. Step 5: Solve for x
    x = 840,239.88/914.79
  6. Step 6: Final answer
    x = 918.51

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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.