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Finding the Fourth Proportional to 28,587.45, 42,882.80 and 8,868.81

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Solution

The fourth proportional to 28,587.45, 42,882.80 and 8,868.81 is: 13,303.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,587.45 : 42,882.80 = 8,868.81 : x
  2. Step 2: Convert to fraction form
    28,587.45/42,882.80 = 8,868.81/x
  3. Step 3: Cross multiply
    28,587.45x = 42,882.80 × 8,868.81
  4. Step 4: Simplify right side
    28,587.45x = 380,319,361.12
  5. Step 5: Solve for x
    x = 380,319,361.12/28,587.45
  6. Step 6: Final answer
    x = 13,303.72

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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.