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Finding the Fourth Proportional to 390,925.28, 539,431.28 and 218,852.64

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Solution

The fourth proportional to 390,925.28, 539,431.28 and 218,852.64 is: 301,991.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,925.28 : 539,431.28 = 218,852.64 : x
  2. Step 2: Convert to fraction form
    390,925.28/539,431.28 = 218,852.64/x
  3. Step 3: Cross multiply
    390,925.28x = 539,431.28 × 218,852.64
  4. Step 4: Simplify right side
    390,925.28x = 118,055,959,726.58
  5. Step 5: Solve for x
    x = 118,055,959,726.58/390,925.28
  6. Step 6: Final answer
    x = 301,991.11

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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.