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Finding the Fourth Proportional to 709.22, 978.55 and 410.40

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Solution

The fourth proportional to 709.22, 978.55 and 410.40 is: 566.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.22 : 978.55 = 410.40 : x
  2. Step 2: Convert to fraction form
    709.22/978.55 = 410.40/x
  3. Step 3: Cross multiply
    709.22x = 978.55 × 410.40
  4. Step 4: Simplify right side
    709.22x = 401,595.89
  5. Step 5: Solve for x
    x = 401,595.89/709.22
  6. Step 6: Final answer
    x = 566.25

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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.