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Finding the Fourth Proportional to 709.73, 978.05 and 578.51

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Solution

The fourth proportional to 709.73, 978.05 and 578.51 is: 797.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.73 : 978.05 = 578.51 : x
  2. Step 2: Convert to fraction form
    709.73/978.05 = 578.51/x
  3. Step 3: Cross multiply
    709.73x = 978.05 × 578.51
  4. Step 4: Simplify right side
    709.73x = 565,808.81
  5. Step 5: Solve for x
    x = 565,808.81/709.73
  6. Step 6: Final answer
    x = 797.22

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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.