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Finding the Fourth Proportional to 21,000.48, 31,456.80 and 9,916.80

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Solution

The fourth proportional to 21,000.48, 31,456.80 and 9,916.80 is: 14,854.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.48 : 31,456.80 = 9,916.80 : x
  2. Step 2: Convert to fraction form
    21,000.48/31,456.80 = 9,916.80/x
  3. Step 3: Cross multiply
    21,000.48x = 31,456.80 × 9,916.80
  4. Step 4: Simplify right side
    21,000.48x = 311,950,794.24
  5. Step 5: Solve for x
    x = 311,950,794.24/21,000.48
  6. Step 6: Final answer
    x = 14,854.46

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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.