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Finding the Fourth Proportional to 390,478.56, 585,507.36 and 210,660.39

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Solution

The fourth proportional to 390,478.56, 585,507.36 and 210,660.39 is: 315,877.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,478.56 : 585,507.36 = 210,660.39 : x
  2. Step 2: Convert to fraction form
    390,478.56/585,507.36 = 210,660.39/x
  3. Step 3: Cross multiply
    390,478.56x = 585,507.36 × 210,660.39
  4. Step 4: Simplify right side
    390,478.56x = 123,343,208,805.47
  5. Step 5: Solve for x
    x = 123,343,208,805.47/390,478.56
  6. Step 6: Final answer
    x = 315,877.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.