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Finding the Fourth Proportional to 21,235.52, 31,840.98 and 7,190.86

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Solution

The fourth proportional to 21,235.52, 31,840.98 and 7,190.86 is: 10,782.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,235.52 : 31,840.98 = 7,190.86 : x
  2. Step 2: Convert to fraction form
    21,235.52/31,840.98 = 7,190.86/x
  3. Step 3: Cross multiply
    21,235.52x = 31,840.98 × 7,190.86
  4. Step 4: Simplify right side
    21,235.52x = 228,963,993.49
  5. Step 5: Solve for x
    x = 228,963,993.49/21,235.52
  6. Step 6: Final answer
    x = 10,782.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.