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Finding the Fourth Proportional to 19,187.40, 28,810.80 and 10,439.40

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Solution

The fourth proportional to 19,187.40, 28,810.80 and 10,439.40 is: 15,675.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,187.40 : 28,810.80 = 10,439.40 : x
  2. Step 2: Convert to fraction form
    19,187.40/28,810.80 = 10,439.40/x
  3. Step 3: Cross multiply
    19,187.40x = 28,810.80 × 10,439.40
  4. Step 4: Simplify right side
    19,187.40x = 300,767,465.52
  5. Step 5: Solve for x
    x = 300,767,465.52/19,187.40
  6. Step 6: Final answer
    x = 15,675.26

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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.