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Finding the Fourth Proportional to 1,389.66, 1,916.66 and 969.88

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Solution

The fourth proportional to 1,389.66, 1,916.66 and 969.88 is: 1,337.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.66 : 1,916.66 = 969.88 : x
  2. Step 2: Convert to fraction form
    1,389.66/1,916.66 = 969.88/x
  3. Step 3: Cross multiply
    1,389.66x = 1,916.66 × 969.88
  4. Step 4: Simplify right side
    1,389.66x = 1,858,927.83
  5. Step 5: Solve for x
    x = 1,858,927.83/1,389.66
  6. Step 6: Final answer
    x = 1,337.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.