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Finding the Fourth Proportional to 716.19, 986.25 and 615.78

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Solution

The fourth proportional to 716.19, 986.25 and 615.78 is: 847.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.19 : 986.25 = 615.78 : x
  2. Step 2: Convert to fraction form
    716.19/986.25 = 615.78/x
  3. Step 3: Cross multiply
    716.19x = 986.25 × 615.78
  4. Step 4: Simplify right side
    716.19x = 607,313.03
  5. Step 5: Solve for x
    x = 607,313.03/716.19
  6. Step 6: Final answer
    x = 847.98

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Half scale
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Double scale
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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.