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Finding the Fourth Proportional to 981.51, 1,472.27 and 790.35

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Solution

The fourth proportional to 981.51, 1,472.27 and 790.35 is: 1,185.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.51 : 1,472.27 = 790.35 : x
  2. Step 2: Convert to fraction form
    981.51/1,472.27 = 790.35/x
  3. Step 3: Cross multiply
    981.51x = 1,472.27 × 790.35
  4. Step 4: Simplify right side
    981.51x = 1,163,604.64
  5. Step 5: Solve for x
    x = 1,163,604.64/981.51
  6. Step 6: Final answer
    x = 1,185.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.