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Finding the Fourth Proportional to 390,908.28, 539,477.28 and 218,822.88

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Solution

The fourth proportional to 390,908.28, 539,477.28 and 218,822.88 is: 301,988.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,908.28 : 539,477.28 = 218,822.88 : x
  2. Step 2: Convert to fraction form
    390,908.28/539,477.28 = 218,822.88/x
  3. Step 3: Cross multiply
    390,908.28x = 539,477.28 × 218,822.88
  4. Step 4: Simplify right side
    390,908.28x = 118,049,972,104.17
  5. Step 5: Solve for x
    x = 118,049,972,104.17/390,908.28
  6. Step 6: Final answer
    x = 301,988.93

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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.