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Finding the Fourth Proportional to 709.48, 978.48 and 520.68

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Solution

The fourth proportional to 709.48, 978.48 and 520.68 is: 718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.48 : 978.48 = 520.68 : x
  2. Step 2: Convert to fraction form
    709.48/978.48 = 520.68/x
  3. Step 3: Cross multiply
    709.48x = 978.48 × 520.68
  4. Step 4: Simplify right side
    709.48x = 509,474.97
  5. Step 5: Solve for x
    x = 509,474.97/709.48
  6. Step 6: Final answer
    x = 718.10

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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.