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Finding the Fourth Proportional to 306,431.80, 422,527.18 and 215,758.76

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Solution

The fourth proportional to 306,431.80, 422,527.18 and 215,758.76 is: 297,501.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,431.80 : 422,527.18 = 215,758.76 : x
  2. Step 2: Convert to fraction form
    306,431.80/422,527.18 = 215,758.76/x
  3. Step 3: Cross multiply
    306,431.80x = 422,527.18 × 215,758.76
  4. Step 4: Simplify right side
    306,431.80x = 91,163,940,423.10
  5. Step 5: Solve for x
    x = 91,163,940,423.10/306,431.80
  6. Step 6: Final answer
    x = 297,501.57

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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.