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Finding the Fourth Proportional to 648.46, 895.61 and 428.39

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Solution

The fourth proportional to 648.46, 895.61 and 428.39 is: 591.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.46 : 895.61 = 428.39 : x
  2. Step 2: Convert to fraction form
    648.46/895.61 = 428.39/x
  3. Step 3: Cross multiply
    648.46x = 895.61 × 428.39
  4. Step 4: Simplify right side
    648.46x = 383,667.91
  5. Step 5: Solve for x
    x = 383,667.91/648.46
  6. Step 6: Final answer
    x = 591.66

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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.