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Finding the Fourth Proportional to 672.90, 928.71 and 628.98

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Solution

The fourth proportional to 672.90, 928.71 and 628.98 is: 868.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.90 : 928.71 = 628.98 : x
  2. Step 2: Convert to fraction form
    672.90/928.71 = 628.98/x
  3. Step 3: Cross multiply
    672.90x = 928.71 × 628.98
  4. Step 4: Simplify right side
    672.90x = 584,140.02
  5. Step 5: Solve for x
    x = 584,140.02/672.90
  6. Step 6: Final answer
    x = 868.09

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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.