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Finding the Fourth Proportional to 15,219.98, 21,007.08 and 9,905.58

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Solution

The fourth proportional to 15,219.98, 21,007.08 and 9,905.58 is: 13,671.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,219.98 : 21,007.08 = 9,905.58 : x
  2. Step 2: Convert to fraction form
    15,219.98/21,007.08 = 9,905.58/x
  3. Step 3: Cross multiply
    15,219.98x = 21,007.08 × 9,905.58
  4. Step 4: Simplify right side
    15,219.98x = 208,087,311.51
  5. Step 5: Solve for x
    x = 208,087,311.51/15,219.98
  6. Step 6: Final answer
    x = 13,671.98

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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.