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Finding the Fourth Proportional to 770.76, 1,152.89 and 615.51

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Solution

The fourth proportional to 770.76, 1,152.89 and 615.51 is: 920.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.76 : 1,152.89 = 615.51 : x
  2. Step 2: Convert to fraction form
    770.76/1,152.89 = 615.51/x
  3. Step 3: Cross multiply
    770.76x = 1,152.89 × 615.51
  4. Step 4: Simplify right side
    770.76x = 709,609.56
  5. Step 5: Solve for x
    x = 709,609.56/770.76
  6. Step 6: Final answer
    x = 920.67

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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.