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Finding the Fourth Proportional to 390,059.20, 585,088.80 and 331,010.20

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Solution

The fourth proportional to 390,059.20, 585,088.80 and 331,010.20 is: 496,515.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,059.20 : 585,088.80 = 331,010.20 : x
  2. Step 2: Convert to fraction form
    390,059.20/585,088.80 = 331,010.20/x
  3. Step 3: Cross multiply
    390,059.20x = 585,088.80 × 331,010.20
  4. Step 4: Simplify right side
    390,059.20x = 193,670,360,705.76
  5. Step 5: Solve for x
    x = 193,670,360,705.76/390,059.20
  6. Step 6: Final answer
    x = 496,515.30

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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.