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Finding the Fourth Proportional to 1,315.06, 1,971.19 and 989.42

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Solution

The fourth proportional to 1,315.06, 1,971.19 and 989.42 is: 1,483.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.06 : 1,971.19 = 989.42 : x
  2. Step 2: Convert to fraction form
    1,315.06/1,971.19 = 989.42/x
  3. Step 3: Cross multiply
    1,315.06x = 1,971.19 × 989.42
  4. Step 4: Simplify right side
    1,315.06x = 1,950,334.81
  5. Step 5: Solve for x
    x = 1,950,334.81/1,315.06
  6. Step 6: Final answer
    x = 1,483.08

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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.