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Finding the Fourth Proportional to 704.81, 972.65 and 390.08

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Solution

The fourth proportional to 704.81, 972.65 and 390.08 is: 538.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.81 : 972.65 = 390.08 : x
  2. Step 2: Convert to fraction form
    704.81/972.65 = 390.08/x
  3. Step 3: Cross multiply
    704.81x = 972.65 × 390.08
  4. Step 4: Simplify right side
    704.81x = 379,413.26
  5. Step 5: Solve for x
    x = 379,413.26/704.81
  6. Step 6: Final answer
    x = 538.32

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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.