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Finding the Fourth Proportional to 687.12, 947.88 and 674.16

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Solution

The fourth proportional to 687.12, 947.88 and 674.16 is: 930.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.12 : 947.88 = 674.16 : x
  2. Step 2: Convert to fraction form
    687.12/947.88 = 674.16/x
  3. Step 3: Cross multiply
    687.12x = 947.88 × 674.16
  4. Step 4: Simplify right side
    687.12x = 639,022.78
  5. Step 5: Solve for x
    x = 639,022.78/687.12
  6. Step 6: Final answer
    x = 930.00

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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.