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Finding the Fourth Proportional to 15,580.40, 21,489.08 and 9,916.08

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Solution

The fourth proportional to 15,580.40, 21,489.08 and 9,916.08 is: 13,676.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,580.40 : 21,489.08 = 9,916.08 : x
  2. Step 2: Convert to fraction form
    15,580.40/21,489.08 = 9,916.08/x
  3. Step 3: Cross multiply
    15,580.40x = 21,489.08 × 9,916.08
  4. Step 4: Simplify right side
    15,580.40x = 213,087,436.41
  5. Step 5: Solve for x
    x = 213,087,436.41/15,580.40
  6. Step 6: Final answer
    x = 13,676.63

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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.