Home / 15,285.18-21,102.75-9,988.86

Finding the Fourth Proportional to 15,285.18, 21,102.75 and 9,988.86

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Solution

The fourth proportional to 15,285.18, 21,102.75 and 9,988.86 is: 13,790.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,285.18 : 21,102.75 = 9,988.86 : x
  2. Step 2: Convert to fraction form
    15,285.18/21,102.75 = 9,988.86/x
  3. Step 3: Cross multiply
    15,285.18x = 21,102.75 × 9,988.86
  4. Step 4: Simplify right side
    15,285.18x = 210,792,415.37
  5. Step 5: Solve for x
    x = 210,792,415.37/15,285.18
  6. Step 6: Final answer
    x = 13,790.64

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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.