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Finding the Fourth Proportional to 976.66, 1,455.13 and 913.82

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Solution

The fourth proportional to 976.66, 1,455.13 and 913.82 is: 1,361.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.66 : 1,455.13 = 913.82 : x
  2. Step 2: Convert to fraction form
    976.66/1,455.13 = 913.82/x
  3. Step 3: Cross multiply
    976.66x = 1,455.13 × 913.82
  4. Step 4: Simplify right side
    976.66x = 1,329,720.76
  5. Step 5: Solve for x
    x = 1,329,720.76/976.66
  6. Step 6: Final answer
    x = 1,361.50

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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.