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Finding the Fourth Proportional to 709.04, 978.51 and 429.28

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Solution

The fourth proportional to 709.04, 978.51 and 429.28 is: 592.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.04 : 978.51 = 429.28 : x
  2. Step 2: Convert to fraction form
    709.04/978.51 = 429.28/x
  3. Step 3: Cross multiply
    709.04x = 978.51 × 429.28
  4. Step 4: Simplify right side
    709.04x = 420,054.77
  5. Step 5: Solve for x
    x = 420,054.77/709.04
  6. Step 6: Final answer
    x = 592.43

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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.