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Finding the Fourth Proportional to 672.95, 928.58 and 389.42

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Solution

The fourth proportional to 672.95, 928.58 and 389.42 is: 537.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.95 : 928.58 = 389.42 : x
  2. Step 2: Convert to fraction form
    672.95/928.58 = 389.42/x
  3. Step 3: Cross multiply
    672.95x = 928.58 × 389.42
  4. Step 4: Simplify right side
    672.95x = 361,603.95
  5. Step 5: Solve for x
    x = 361,603.95/672.95
  6. Step 6: Final answer
    x = 537.34

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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.