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Finding the Fourth Proportional to 991.36, 1,366.50 and 910

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Solution

The fourth proportional to 991.36, 1,366.50 and 910 is: 1,254.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.36 : 1,366.50 = 910 : x
  2. Step 2: Convert to fraction form
    991.36/1,366.50 = 910/x
  3. Step 3: Cross multiply
    991.36x = 1,366.50 × 910
  4. Step 4: Simplify right side
    991.36x = 1,243,515
  5. Step 5: Solve for x
    x = 1,243,515/991.36
  6. Step 6: Final answer
    x = 1,254.35

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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.