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Finding the Fourth Proportional to 763.81, 1,145.76 and 474.64

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Solution

The fourth proportional to 763.81, 1,145.76 and 474.64 is: 711.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.81 : 1,145.76 = 474.64 : x
  2. Step 2: Convert to fraction form
    763.81/1,145.76 = 474.64/x
  3. Step 3: Cross multiply
    763.81x = 1,145.76 × 474.64
  4. Step 4: Simplify right side
    763.81x = 543,823.53
  5. Step 5: Solve for x
    x = 543,823.53/763.81
  6. Step 6: Final answer
    x = 711.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.