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Finding the Fourth Proportional to 673.32, 928.91 and 389.55

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Solution

The fourth proportional to 673.32, 928.91 and 389.55 is: 537.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.32 : 928.91 = 389.55 : x
  2. Step 2: Convert to fraction form
    673.32/928.91 = 389.55/x
  3. Step 3: Cross multiply
    673.32x = 928.91 × 389.55
  4. Step 4: Simplify right side
    673.32x = 361,856.89
  5. Step 5: Solve for x
    x = 361,856.89/673.32
  6. Step 6: Final answer
    x = 537.42

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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.