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Finding the Fourth Proportional to 18,870.69, 28,300.97 and 8,990.31

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Solution

The fourth proportional to 18,870.69, 28,300.97 and 8,990.31 is: 13,483.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.69 : 28,300.97 = 8,990.31 : x
  2. Step 2: Convert to fraction form
    18,870.69/28,300.97 = 8,990.31/x
  3. Step 3: Cross multiply
    18,870.69x = 28,300.97 × 8,990.31
  4. Step 4: Simplify right side
    18,870.69x = 254,434,307.14
  5. Step 5: Solve for x
    x = 254,434,307.14/18,870.69
  6. Step 6: Final answer
    x = 13,483.05

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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.