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Finding the Fourth Proportional to 864.68, 1,290.38 and 772.40

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Solution

The fourth proportional to 864.68, 1,290.38 and 772.40 is: 1,152.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.68 : 1,290.38 = 772.40 : x
  2. Step 2: Convert to fraction form
    864.68/1,290.38 = 772.40/x
  3. Step 3: Cross multiply
    864.68x = 1,290.38 × 772.40
  4. Step 4: Simplify right side
    864.68x = 996,688.88
  5. Step 5: Solve for x
    x = 996,688.88/864.68
  6. Step 6: Final answer
    x = 1,152.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.