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Finding the Fourth Proportional to 1,210.69, 1,815.36 and 480.07

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Solution

The fourth proportional to 1,210.69, 1,815.36 and 480.07 is: 719.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.69 : 1,815.36 = 480.07 : x
  2. Step 2: Convert to fraction form
    1,210.69/1,815.36 = 480.07/x
  3. Step 3: Cross multiply
    1,210.69x = 1,815.36 × 480.07
  4. Step 4: Simplify right side
    1,210.69x = 871,499.88
  5. Step 5: Solve for x
    x = 871,499.88/1,210.69
  6. Step 6: Final answer
    x = 719.84

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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.