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Finding the Fourth Proportional to 1,079.45, 1,488.12 and 912.99

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Solution

The fourth proportional to 1,079.45, 1,488.12 and 912.99 is: 1,258.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.45 : 1,488.12 = 912.99 : x
  2. Step 2: Convert to fraction form
    1,079.45/1,488.12 = 912.99/x
  3. Step 3: Cross multiply
    1,079.45x = 1,488.12 × 912.99
  4. Step 4: Simplify right side
    1,079.45x = 1,358,638.68
  5. Step 5: Solve for x
    x = 1,358,638.68/1,079.45
  6. Step 6: Final answer
    x = 1,258.64

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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.