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Finding the Fourth Proportional to 12,221.55, 16,866.77 and 6,918.08

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Solution

The fourth proportional to 12,221.55, 16,866.77 and 6,918.08 is: 9,547.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.55 : 16,866.77 = 6,918.08 : x
  2. Step 2: Convert to fraction form
    12,221.55/16,866.77 = 6,918.08/x
  3. Step 3: Cross multiply
    12,221.55x = 16,866.77 × 6,918.08
  4. Step 4: Simplify right side
    12,221.55x = 116,685,545.28
  5. Step 5: Solve for x
    x = 116,685,545.28/12,221.55
  6. Step 6: Final answer
    x = 9,547.52

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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.