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Finding the Fourth Proportional to 709.02, 978.06 and 429.12

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Solution

The fourth proportional to 709.02, 978.06 and 429.12 is: 591.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.02 : 978.06 = 429.12 : x
  2. Step 2: Convert to fraction form
    709.02/978.06 = 429.12/x
  3. Step 3: Cross multiply
    709.02x = 978.06 × 429.12
  4. Step 4: Simplify right side
    709.02x = 419,705.11
  5. Step 5: Solve for x
    x = 419,705.11/709.02
  6. Step 6: Final answer
    x = 591.95

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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.