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Finding the Fourth Proportional to 390,400.20, 585,665.10 and 153,750.60

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Solution

The fourth proportional to 390,400.20, 585,665.10 and 153,750.60 is: 230,651.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,400.20 : 585,665.10 = 153,750.60 : x
  2. Step 2: Convert to fraction form
    390,400.20/585,665.10 = 153,750.60/x
  3. Step 3: Cross multiply
    390,400.20x = 585,665.10 × 153,750.60
  4. Step 4: Simplify right side
    390,400.20x = 90,046,360,524.06
  5. Step 5: Solve for x
    x = 90,046,360,524.06/390,400.20
  6. Step 6: Final answer
    x = 230,651.42

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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.