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Finding the Fourth Proportional to 918.68, 1,263.99 and 807.96

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Solution

The fourth proportional to 918.68, 1,263.99 and 807.96 is: 1,111.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.68 : 1,263.99 = 807.96 : x
  2. Step 2: Convert to fraction form
    918.68/1,263.99 = 807.96/x
  3. Step 3: Cross multiply
    918.68x = 1,263.99 × 807.96
  4. Step 4: Simplify right side
    918.68x = 1,021,253.36
  5. Step 5: Solve for x
    x = 1,021,253.36/918.68
  6. Step 6: Final answer
    x = 1,111.66

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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.