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Finding the Fourth Proportional to 830.84, 1,245.49 and 521.75

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Solution

The fourth proportional to 830.84, 1,245.49 and 521.75 is: 782.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.84 : 1,245.49 = 521.75 : x
  2. Step 2: Convert to fraction form
    830.84/1,245.49 = 521.75/x
  3. Step 3: Cross multiply
    830.84x = 1,245.49 × 521.75
  4. Step 4: Simplify right side
    830.84x = 649,834.41
  5. Step 5: Solve for x
    x = 649,834.41/830.84
  6. Step 6: Final answer
    x = 782.14

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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.