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Finding the Fourth Proportional to 28,590.21, 42,889.47 and 8,870.34

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Solution

The fourth proportional to 28,590.21, 42,889.47 and 8,870.34 is: 13,306.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,590.21 : 42,889.47 = 8,870.34 : x
  2. Step 2: Convert to fraction form
    28,590.21/42,889.47 = 8,870.34/x
  3. Step 3: Cross multiply
    28,590.21x = 42,889.47 × 8,870.34
  4. Step 4: Simplify right side
    28,590.21x = 380,444,181.32
  5. Step 5: Solve for x
    x = 380,444,181.32/28,590.21
  6. Step 6: Final answer
    x = 13,306.80

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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.