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Finding the Fourth Proportional to 420,718.32, 630,760.32 and 218,096.40

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Solution

The fourth proportional to 420,718.32, 630,760.32 and 218,096.40 is: 326,980.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,718.32 : 630,760.32 = 218,096.40 : x
  2. Step 2: Convert to fraction form
    420,718.32/630,760.32 = 218,096.40/x
  3. Step 3: Cross multiply
    420,718.32x = 630,760.32 × 218,096.40
  4. Step 4: Simplify right side
    420,718.32x = 137,566,555,054.85
  5. Step 5: Solve for x
    x = 137,566,555,054.85/420,718.32
  6. Step 6: Final answer
    x = 326,980.19

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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.