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Finding the Fourth Proportional to 951.81, 1,312.20 and 931.11

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Solution

The fourth proportional to 951.81, 1,312.20 and 931.11 is: 1,283.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.81 : 1,312.20 = 931.11 : x
  2. Step 2: Convert to fraction form
    951.81/1,312.20 = 931.11/x
  3. Step 3: Cross multiply
    951.81x = 1,312.20 × 931.11
  4. Step 4: Simplify right side
    951.81x = 1,221,802.54
  5. Step 5: Solve for x
    x = 1,221,802.54/951.81
  6. Step 6: Final answer
    x = 1,283.66

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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.