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Finding the Fourth Proportional to 20,955, 28,900.62 and 12,565.56

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Solution

The fourth proportional to 20,955, 28,900.62 and 12,565.56 is: 17,330.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,955 : 28,900.62 = 12,565.56 : x
  2. Step 2: Convert to fraction form
    20,955/28,900.62 = 12,565.56/x
  3. Step 3: Cross multiply
    20,955x = 28,900.62 × 12,565.56
  4. Step 4: Simplify right side
    20,955x = 363,152,474.65
  5. Step 5: Solve for x
    x = 363,152,474.65/20,955
  6. Step 6: Final answer
    x = 17,330.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.