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Finding the Fourth Proportional to 1,307.86, 1,962.13 and 486.37

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Solution

The fourth proportional to 1,307.86, 1,962.13 and 486.37 is: 729.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.86 : 1,962.13 = 486.37 : x
  2. Step 2: Convert to fraction form
    1,307.86/1,962.13 = 486.37/x
  3. Step 3: Cross multiply
    1,307.86x = 1,962.13 × 486.37
  4. Step 4: Simplify right side
    1,307.86x = 954,308.93
  5. Step 5: Solve for x
    x = 954,308.93/1,307.86
  6. Step 6: Final answer
    x = 729.67

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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.