Home / 21,006.48-31,491.60-9,905.40

Finding the Fourth Proportional to 21,006.48, 31,491.60 and 9,905.40

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Solution

The fourth proportional to 21,006.48, 31,491.60 and 9,905.40 is: 14,849.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.48 : 31,491.60 = 9,905.40 : x
  2. Step 2: Convert to fraction form
    21,006.48/31,491.60 = 9,905.40/x
  3. Step 3: Cross multiply
    21,006.48x = 31,491.60 × 9,905.40
  4. Step 4: Simplify right side
    21,006.48x = 311,936,894.64
  5. Step 5: Solve for x
    x = 311,936,894.64/21,006.48
  6. Step 6: Final answer
    x = 14,849.56

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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.