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Finding the Fourth Proportional to 1,980.86, 2,971.07 and 520.13

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Solution

The fourth proportional to 1,980.86, 2,971.07 and 520.13 is: 780.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.86 : 2,971.07 = 520.13 : x
  2. Step 2: Convert to fraction form
    1,980.86/2,971.07 = 520.13/x
  3. Step 3: Cross multiply
    1,980.86x = 2,971.07 × 520.13
  4. Step 4: Simplify right side
    1,980.86x = 1,545,325.18
  5. Step 5: Solve for x
    x = 1,545,325.18/1,980.86
  6. Step 6: Final answer
    x = 780.13

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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.