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Finding the Fourth Proportional to 522.40, 783.60 and 313.60

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Solution

The fourth proportional to 522.40, 783.60 and 313.60 is: 470.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.40 : 783.60 = 313.60 : x
  2. Step 2: Convert to fraction form
    522.40/783.60 = 313.60/x
  3. Step 3: Cross multiply
    522.40x = 783.60 × 313.60
  4. Step 4: Simplify right side
    522.40x = 245,736.96
  5. Step 5: Solve for x
    x = 245,736.96/522.40
  6. Step 6: Final answer
    x = 470.40

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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.