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Finding the Fourth Proportional to 306,125.20, 428,925.20 and 306,125.20

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Solution

The fourth proportional to 306,125.20, 428,925.20 and 306,125.20 is: 428,925.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,125.20 : 428,925.20 = 306,125.20 : x
  2. Step 2: Convert to fraction form
    306,125.20/428,925.20 = 306,125.20/x
  3. Step 3: Cross multiply
    306,125.20x = 428,925.20 × 306,125.20
  4. Step 4: Simplify right side
    306,125.20x = 131,304,812,635.04
  5. Step 5: Solve for x
    x = 131,304,812,635.04/306,125.20
  6. Step 6: Final answer
    x = 428,925.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.