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Finding the Fourth Proportional to 390,754.09, 539,121.58 and 218,654.20

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Solution

The fourth proportional to 390,754.09, 539,121.58 and 218,654.20 is: 301,676.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,754.09 : 539,121.58 = 218,654.20 : x
  2. Step 2: Convert to fraction form
    390,754.09/539,121.58 = 218,654.20/x
  3. Step 3: Cross multiply
    390,754.09x = 539,121.58 × 218,654.20
  4. Step 4: Simplify right side
    390,754.09x = 117,881,197,777.64
  5. Step 5: Solve for x
    x = 117,881,197,777.64/390,754.09
  6. Step 6: Final answer
    x = 301,676.17

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1.5x scale

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.