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Finding the Fourth Proportional to 19,140.80, 28,686.90 and 10,368.50

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Solution

The fourth proportional to 19,140.80, 28,686.90 and 10,368.50 is: 15,539.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,140.80 : 28,686.90 = 10,368.50 : x
  2. Step 2: Convert to fraction form
    19,140.80/28,686.90 = 10,368.50/x
  3. Step 3: Cross multiply
    19,140.80x = 28,686.90 × 10,368.50
  4. Step 4: Simplify right side
    19,140.80x = 297,440,122.65
  5. Step 5: Solve for x
    x = 297,440,122.65/19,140.80
  6. Step 6: Final answer
    x = 15,539.59

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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.