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Finding the Fourth Proportional to 17,870.80, 26,806.20 and 12,686.80

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Solution

The fourth proportional to 17,870.80, 26,806.20 and 12,686.80 is: 19,030.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,870.80 : 26,806.20 = 12,686.80 : x
  2. Step 2: Convert to fraction form
    17,870.80/26,806.20 = 12,686.80/x
  3. Step 3: Cross multiply
    17,870.80x = 26,806.20 × 12,686.80
  4. Step 4: Simplify right side
    17,870.80x = 340,084,898.16
  5. Step 5: Solve for x
    x = 340,084,898.16/17,870.80
  6. Step 6: Final answer
    x = 19,030.20

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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.