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Finding the Fourth Proportional to 928.84, 1,278.88 and 788.67

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Solution

The fourth proportional to 928.84, 1,278.88 and 788.67 is: 1,085.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.84 : 1,278.88 = 788.67 : x
  2. Step 2: Convert to fraction form
    928.84/1,278.88 = 788.67/x
  3. Step 3: Cross multiply
    928.84x = 1,278.88 × 788.67
  4. Step 4: Simplify right side
    928.84x = 1,008,614.29
  5. Step 5: Solve for x
    x = 1,008,614.29/928.84
  6. Step 6: Final answer
    x = 1,085.89

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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.