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Finding the Fourth Proportional to 709.12, 978.60 and 433.12

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Solution

The fourth proportional to 709.12, 978.60 and 433.12 is: 597.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.12 : 978.60 = 433.12 : x
  2. Step 2: Convert to fraction form
    709.12/978.60 = 433.12/x
  3. Step 3: Cross multiply
    709.12x = 978.60 × 433.12
  4. Step 4: Simplify right side
    709.12x = 423,851.23
  5. Step 5: Solve for x
    x = 423,851.23/709.12
  6. Step 6: Final answer
    x = 597.71

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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.