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Finding the Fourth Proportional to 15,159.69, 20,920.39 and 8,787.51

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Solution

The fourth proportional to 15,159.69, 20,920.39 and 8,787.51 is: 12,126.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.69 : 20,920.39 = 8,787.51 : x
  2. Step 2: Convert to fraction form
    15,159.69/20,920.39 = 8,787.51/x
  3. Step 3: Cross multiply
    15,159.69x = 20,920.39 × 8,787.51
  4. Step 4: Simplify right side
    15,159.69x = 183,838,114.36
  5. Step 5: Solve for x
    x = 183,838,114.36/15,159.69
  6. Step 6: Final answer
    x = 12,126.77

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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.