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Finding the Fourth Proportional to 390,722.32, 539,247.44 and 220,990

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Solution

The fourth proportional to 390,722.32, 539,247.44 and 220,990 is: 304,994.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,722.32 : 539,247.44 = 220,990 : x
  2. Step 2: Convert to fraction form
    390,722.32/539,247.44 = 220,990/x
  3. Step 3: Cross multiply
    390,722.32x = 539,247.44 × 220,990
  4. Step 4: Simplify right side
    390,722.32x = 119,168,291,765.60
  5. Step 5: Solve for x
    x = 119,168,291,765.60/390,722.32
  6. Step 6: Final answer
    x = 304,994.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.