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Finding the Fourth Proportional to 18,957.90, 26,166.60 and 12,918.14

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Solution

The fourth proportional to 18,957.90, 26,166.60 and 12,918.14 is: 17,830.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.90 : 26,166.60 = 12,918.14 : x
  2. Step 2: Convert to fraction form
    18,957.90/26,166.60 = 12,918.14/x
  3. Step 3: Cross multiply
    18,957.90x = 26,166.60 × 12,918.14
  4. Step 4: Simplify right side
    18,957.90x = 338,023,802.12
  5. Step 5: Solve for x
    x = 338,023,802.12/18,957.90
  6. Step 6: Final answer
    x = 17,830.23

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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.