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Finding the Fourth Proportional to 18,702.95, 25,810.35 and 11,153.66

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Solution

The fourth proportional to 18,702.95, 25,810.35 and 11,153.66 is: 15,392.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.95 : 25,810.35 = 11,153.66 : x
  2. Step 2: Convert to fraction form
    18,702.95/25,810.35 = 11,153.66/x
  3. Step 3: Cross multiply
    18,702.95x = 25,810.35 × 11,153.66
  4. Step 4: Simplify right side
    18,702.95x = 287,879,868.38
  5. Step 5: Solve for x
    x = 287,879,868.38/18,702.95
  6. Step 6: Final answer
    x = 15,392.22

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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.