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Finding the Fourth Proportional to 710.55, 980.57 and 400.05

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Solution

The fourth proportional to 710.55, 980.57 and 400.05 is: 552.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.55 : 980.57 = 400.05 : x
  2. Step 2: Convert to fraction form
    710.55/980.57 = 400.05/x
  3. Step 3: Cross multiply
    710.55x = 980.57 × 400.05
  4. Step 4: Simplify right side
    710.55x = 392,277.03
  5. Step 5: Solve for x
    x = 392,277.03/710.55
  6. Step 6: Final answer
    x = 552.08

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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.