Home / 20,690.46-31,148.70-14,157.78

Finding the Fourth Proportional to 20,690.46, 31,148.70 and 14,157.78

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Solution

The fourth proportional to 20,690.46, 31,148.70 and 14,157.78 is: 21,314.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.46 : 31,148.70 = 14,157.78 : x
  2. Step 2: Convert to fraction form
    20,690.46/31,148.70 = 14,157.78/x
  3. Step 3: Cross multiply
    20,690.46x = 31,148.70 × 14,157.78
  4. Step 4: Simplify right side
    20,690.46x = 440,996,441.89
  5. Step 5: Solve for x
    x = 440,996,441.89/20,690.46
  6. Step 6: Final answer
    x = 21,314.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.