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Finding the Fourth Proportional to 15,726.80, 21,703.20 and 8,653.52

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Solution

The fourth proportional to 15,726.80, 21,703.20 and 8,653.52 is: 11,941.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,726.80 : 21,703.20 = 8,653.52 : x
  2. Step 2: Convert to fraction form
    15,726.80/21,703.20 = 8,653.52/x
  3. Step 3: Cross multiply
    15,726.80x = 21,703.20 × 8,653.52
  4. Step 4: Simplify right side
    15,726.80x = 187,809,075.26
  5. Step 5: Solve for x
    x = 187,809,075.26/15,726.80
  6. Step 6: Final answer
    x = 11,941.98

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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.