Home / 12,905.19-17,818.79-9,916.29

Finding the Fourth Proportional to 12,905.19, 17,818.79 and 9,916.29

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Solution

The fourth proportional to 12,905.19, 17,818.79 and 9,916.29 is: 13,691.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.19 : 17,818.79 = 9,916.29 : x
  2. Step 2: Convert to fraction form
    12,905.19/17,818.79 = 9,916.29/x
  3. Step 3: Cross multiply
    12,905.19x = 17,818.79 × 9,916.29
  4. Step 4: Simplify right side
    12,905.19x = 176,696,239.51
  5. Step 5: Solve for x
    x = 176,696,239.51/12,905.19
  6. Step 6: Final answer
    x = 13,691.87

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1.5x scale

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.