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Finding the Fourth Proportional to 21,670.50, 29,907.50 and 15,625.72

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Solution

The fourth proportional to 21,670.50, 29,907.50 and 15,625.72 is: 21,565.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,670.50 : 29,907.50 = 15,625.72 : x
  2. Step 2: Convert to fraction form
    21,670.50/29,907.50 = 15,625.72/x
  3. Step 3: Cross multiply
    21,670.50x = 29,907.50 × 15,625.72
  4. Step 4: Simplify right side
    21,670.50x = 467,326,220.90
  5. Step 5: Solve for x
    x = 467,326,220.90/21,670.50
  6. Step 6: Final answer
    x = 21,565.09

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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.