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Finding the Fourth Proportional to 390,651.66, 539,100.36 and 220,887

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Solution

The fourth proportional to 390,651.66, 539,100.36 and 220,887 is: 304,824.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,651.66 : 539,100.36 = 220,887 : x
  2. Step 2: Convert to fraction form
    390,651.66/539,100.36 = 220,887/x
  3. Step 3: Cross multiply
    390,651.66x = 539,100.36 × 220,887
  4. Step 4: Simplify right side
    390,651.66x = 119,080,261,219.32
  5. Step 5: Solve for x
    x = 119,080,261,219.32/390,651.66
  6. Step 6: Final answer
    x = 304,824.66

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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.