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Finding the Fourth Proportional to 710.20, 978.78 and 700.12

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Solution

The fourth proportional to 710.20, 978.78 and 700.12 is: 964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.20 : 978.78 = 700.12 : x
  2. Step 2: Convert to fraction form
    710.20/978.78 = 700.12/x
  3. Step 3: Cross multiply
    710.20x = 978.78 × 700.12
  4. Step 4: Simplify right side
    710.20x = 685,263.45
  5. Step 5: Solve for x
    x = 685,263.45/710.20
  6. Step 6: Final answer
    x = 964.89

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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.