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Finding the Fourth Proportional to 684.65, 1,028.35 and 425.10

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Solution

The fourth proportional to 684.65, 1,028.35 and 425.10 is: 638.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.65 : 1,028.35 = 425.10 : x
  2. Step 2: Convert to fraction form
    684.65/1,028.35 = 425.10/x
  3. Step 3: Cross multiply
    684.65x = 1,028.35 × 425.10
  4. Step 4: Simplify right side
    684.65x = 437,147.80
  5. Step 5: Solve for x
    x = 437,147.80/684.65
  6. Step 6: Final answer
    x = 638.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.