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Finding the Fourth Proportional to 687.95, 947.99 and 608.66

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Solution

The fourth proportional to 687.95, 947.99 and 608.66 is: 838.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.95 : 947.99 = 608.66 : x
  2. Step 2: Convert to fraction form
    687.95/947.99 = 608.66/x
  3. Step 3: Cross multiply
    687.95x = 947.99 × 608.66
  4. Step 4: Simplify right side
    687.95x = 576,995.81
  5. Step 5: Solve for x
    x = 576,995.81/687.95
  6. Step 6: Final answer
    x = 838.72

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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.