Home / 10,905.21-15,050.75-7,890.12

Finding the Fourth Proportional to 10,905.21, 15,050.75 and 7,890.12

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Solution

The fourth proportional to 10,905.21, 15,050.75 and 7,890.12 is: 10,889.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,905.21 : 15,050.75 = 7,890.12 : x
  2. Step 2: Convert to fraction form
    10,905.21/15,050.75 = 7,890.12/x
  3. Step 3: Cross multiply
    10,905.21x = 15,050.75 × 7,890.12
  4. Step 4: Simplify right side
    10,905.21x = 118,752,184.14
  5. Step 5: Solve for x
    x = 118,752,184.14/10,905.21
  6. Step 6: Final answer
    x = 10,889.49

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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.