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Finding the Fourth Proportional to 1,005.30, 1,384.20 and 912.60

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Solution

The fourth proportional to 1,005.30, 1,384.20 and 912.60 is: 1,256.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.30 : 1,384.20 = 912.60 : x
  2. Step 2: Convert to fraction form
    1,005.30/1,384.20 = 912.60/x
  3. Step 3: Cross multiply
    1,005.30x = 1,384.20 × 912.60
  4. Step 4: Simplify right side
    1,005.30x = 1,263,220.92
  5. Step 5: Solve for x
    x = 1,263,220.92/1,005.30
  6. Step 6: Final answer
    x = 1,256.56

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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.