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Finding the Fourth Proportional to 690.59, 945.76 and 681.48

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Solution

The fourth proportional to 690.59, 945.76 and 681.48 is: 933.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.59 : 945.76 = 681.48 : x
  2. Step 2: Convert to fraction form
    690.59/945.76 = 681.48/x
  3. Step 3: Cross multiply
    690.59x = 945.76 × 681.48
  4. Step 4: Simplify right side
    690.59x = 644,516.10
  5. Step 5: Solve for x
    x = 644,516.10/690.59
  6. Step 6: Final answer
    x = 933.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.