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Finding the Fourth Proportional to 818.21, 1,128.72 and 607.71

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Solution

The fourth proportional to 818.21, 1,128.72 and 607.71 is: 838.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.21 : 1,128.72 = 607.71 : x
  2. Step 2: Convert to fraction form
    818.21/1,128.72 = 607.71/x
  3. Step 3: Cross multiply
    818.21x = 1,128.72 × 607.71
  4. Step 4: Simplify right side
    818.21x = 685,934.43
  5. Step 5: Solve for x
    x = 685,934.43/818.21
  6. Step 6: Final answer
    x = 838.34

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Half scale
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Double scale
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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.