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Finding the Fourth Proportional to 390,018.80, 585,028.20 and 341,807.60

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Solution

The fourth proportional to 390,018.80, 585,028.20 and 341,807.60 is: 512,711.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,018.80 : 585,028.20 = 341,807.60 : x
  2. Step 2: Convert to fraction form
    390,018.80/585,028.20 = 341,807.60/x
  3. Step 3: Cross multiply
    390,018.80x = 585,028.20 × 341,807.60
  4. Step 4: Simplify right side
    390,018.80x = 199,967,084,974.32
  5. Step 5: Solve for x
    x = 199,967,084,974.32/390,018.80
  6. Step 6: Final answer
    x = 512,711.40

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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.