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Finding the Fourth Proportional to 383,990.40, 575,985.60 and 258,019.20

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Solution

The fourth proportional to 383,990.40, 575,985.60 and 258,019.20 is: 387,028.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    383,990.40 : 575,985.60 = 258,019.20 : x
  2. Step 2: Convert to fraction form
    383,990.40/575,985.60 = 258,019.20/x
  3. Step 3: Cross multiply
    383,990.40x = 575,985.60 × 258,019.20
  4. Step 4: Simplify right side
    383,990.40x = 148,615,343,723.52
  5. Step 5: Solve for x
    x = 148,615,343,723.52/383,990.40
  6. Step 6: Final answer
    x = 387,028.80

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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.