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Finding the Fourth Proportional to 1,078.68, 1,488.06 and 912.36

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Solution

The fourth proportional to 1,078.68, 1,488.06 and 912.36 is: 1,258.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.68 : 1,488.06 = 912.36 : x
  2. Step 2: Convert to fraction form
    1,078.68/1,488.06 = 912.36/x
  3. Step 3: Cross multiply
    1,078.68x = 1,488.06 × 912.36
  4. Step 4: Simplify right side
    1,078.68x = 1,357,646.42
  5. Step 5: Solve for x
    x = 1,357,646.42/1,078.68
  6. Step 6: Final answer
    x = 1,258.62

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1.5x scale

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.