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Finding the Fourth Proportional to 813.70, 1,220.55 and 522.10

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Solution

The fourth proportional to 813.70, 1,220.55 and 522.10 is: 783.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.70 : 1,220.55 = 522.10 : x
  2. Step 2: Convert to fraction form
    813.70/1,220.55 = 522.10/x
  3. Step 3: Cross multiply
    813.70x = 1,220.55 × 522.10
  4. Step 4: Simplify right side
    813.70x = 637,249.16
  5. Step 5: Solve for x
    x = 637,249.16/813.70
  6. Step 6: Final answer
    x = 783.15

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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.