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Finding the Fourth Proportional to 15,225.54, 21,005.07 and 9,918.42

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Solution

The fourth proportional to 15,225.54, 21,005.07 and 9,918.42 is: 13,683.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,225.54 : 21,005.07 = 9,918.42 : x
  2. Step 2: Convert to fraction form
    15,225.54/21,005.07 = 9,918.42/x
  3. Step 3: Cross multiply
    15,225.54x = 21,005.07 × 9,918.42
  4. Step 4: Simplify right side
    15,225.54x = 208,337,106.39
  5. Step 5: Solve for x
    x = 208,337,106.39/15,225.54
  6. Step 6: Final answer
    x = 13,683.40

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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.