Home / 21,689.80-29,931.76-12,258.36

Finding the Fourth Proportional to 21,689.80, 29,931.76 and 12,258.36

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Solution

The fourth proportional to 21,689.80, 29,931.76 and 12,258.36 is: 16,916.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.80 : 29,931.76 = 12,258.36 : x
  2. Step 2: Convert to fraction form
    21,689.80/29,931.76 = 12,258.36/x
  3. Step 3: Cross multiply
    21,689.80x = 29,931.76 × 12,258.36
  4. Step 4: Simplify right side
    21,689.80x = 366,914,289.51
  5. Step 5: Solve for x
    x = 366,914,289.51/21,689.80
  6. Step 6: Final answer
    x = 16,916.44

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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.