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Finding the Fourth Proportional to 710.13, 980.05 and 415.45

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Solution

The fourth proportional to 710.13, 980.05 and 415.45 is: 573.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.13 : 980.05 = 415.45 : x
  2. Step 2: Convert to fraction form
    710.13/980.05 = 415.45/x
  3. Step 3: Cross multiply
    710.13x = 980.05 × 415.45
  4. Step 4: Simplify right side
    710.13x = 407,157.23
  5. Step 5: Solve for x
    x = 407,157.23/710.13
  6. Step 6: Final answer
    x = 573.35

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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.