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Finding the Fourth Proportional to 943.65, 1,301.13 and 663.93

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Solution

The fourth proportional to 943.65, 1,301.13 and 663.93 is: 915.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.65 : 1,301.13 = 663.93 : x
  2. Step 2: Convert to fraction form
    943.65/1,301.13 = 663.93/x
  3. Step 3: Cross multiply
    943.65x = 1,301.13 × 663.93
  4. Step 4: Simplify right side
    943.65x = 863,859.24
  5. Step 5: Solve for x
    x = 863,859.24/943.65
  6. Step 6: Final answer
    x = 915.44

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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.