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Finding the Fourth Proportional to 390,237.88, 585,412.56 and 120,388.72

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Solution

The fourth proportional to 390,237.88, 585,412.56 and 120,388.72 is: 180,600.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,237.88 : 585,412.56 = 120,388.72 : x
  2. Step 2: Convert to fraction form
    390,237.88/585,412.56 = 120,388.72/x
  3. Step 3: Cross multiply
    390,237.88x = 585,412.56 × 120,388.72
  4. Step 4: Simplify right side
    390,237.88x = 70,477,068,770.32
  5. Step 5: Solve for x
    x = 70,477,068,770.32/390,237.88
  6. Step 6: Final answer
    x = 180,600.28

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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.