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Finding the Fourth Proportional to 687.14, 947.58 and 630.23

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Solution

The fourth proportional to 687.14, 947.58 and 630.23 is: 869.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.14 : 947.58 = 630.23 : x
  2. Step 2: Convert to fraction form
    687.14/947.58 = 630.23/x
  3. Step 3: Cross multiply
    687.14x = 947.58 × 630.23
  4. Step 4: Simplify right side
    687.14x = 597,186.24
  5. Step 5: Solve for x
    x = 597,186.24/687.14
  6. Step 6: Final answer
    x = 869.09

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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.