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Finding the Fourth Proportional to 662,019.36, 913,653.96 and 390,174.80

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Solution

The fourth proportional to 662,019.36, 913,653.96 and 390,174.80 is: 538,480.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,019.36 : 913,653.96 = 390,174.80 : x
  2. Step 2: Convert to fraction form
    662,019.36/913,653.96 = 390,174.80/x
  3. Step 3: Cross multiply
    662,019.36x = 913,653.96 × 390,174.80
  4. Step 4: Simplify right side
    662,019.36x = 356,484,751,112.21
  5. Step 5: Solve for x
    x = 356,484,751,112.21/662,019.36
  6. Step 6: Final answer
    x = 538,480.86

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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.