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Finding the Fourth Proportional to 912.84, 1,258.88 and 618.54

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Solution

The fourth proportional to 912.84, 1,258.88 and 618.54 is: 853.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.84 : 1,258.88 = 618.54 : x
  2. Step 2: Convert to fraction form
    912.84/1,258.88 = 618.54/x
  3. Step 3: Cross multiply
    912.84x = 1,258.88 × 618.54
  4. Step 4: Simplify right side
    912.84x = 778,667.64
  5. Step 5: Solve for x
    x = 778,667.64/912.84
  6. Step 6: Final answer
    x = 853.02

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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.