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Finding the Fourth Proportional to 712.35, 979.08 and 628.95

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Solution

The fourth proportional to 712.35, 979.08 and 628.95 is: 864.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.35 : 979.08 = 628.95 : x
  2. Step 2: Convert to fraction form
    712.35/979.08 = 628.95/x
  3. Step 3: Cross multiply
    712.35x = 979.08 × 628.95
  4. Step 4: Simplify right side
    712.35x = 615,792.37
  5. Step 5: Solve for x
    x = 615,792.37/712.35
  6. Step 6: Final answer
    x = 864.45

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.