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Finding the Fourth Proportional to 716.94, 987.09 and 624.90

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Solution

The fourth proportional to 716.94, 987.09 and 624.90 is: 860.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.94 : 987.09 = 624.90 : x
  2. Step 2: Convert to fraction form
    716.94/987.09 = 624.90/x
  3. Step 3: Cross multiply
    716.94x = 987.09 × 624.90
  4. Step 4: Simplify right side
    716.94x = 616,832.54
  5. Step 5: Solve for x
    x = 616,832.54/716.94
  6. Step 6: Final answer
    x = 860.37

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1.5x scale

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.