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Finding the Fourth Proportional to 306,009.20, 459,013.80 and 257,020.40

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Solution

The fourth proportional to 306,009.20, 459,013.80 and 257,020.40 is: 385,530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,009.20 : 459,013.80 = 257,020.40 : x
  2. Step 2: Convert to fraction form
    306,009.20/459,013.80 = 257,020.40/x
  3. Step 3: Cross multiply
    306,009.20x = 459,013.80 × 257,020.40
  4. Step 4: Simplify right side
    306,009.20x = 117,975,910,481.52
  5. Step 5: Solve for x
    x = 117,975,910,481.52/306,009.20
  6. Step 6: Final answer
    x = 385,530.60

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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.