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Finding the Fourth Proportional to 716.15, 987.90 and 421.37

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Solution

The fourth proportional to 716.15, 987.90 and 421.37 is: 581.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.15 : 987.90 = 421.37 : x
  2. Step 2: Convert to fraction form
    716.15/987.90 = 421.37/x
  3. Step 3: Cross multiply
    716.15x = 987.90 × 421.37
  4. Step 4: Simplify right side
    716.15x = 416,271.42
  5. Step 5: Solve for x
    x = 416,271.42/716.15
  6. Step 6: Final answer
    x = 581.26

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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.