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Finding the Fourth Proportional to 770.17, 1,062.79 and 420.79

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Solution

The fourth proportional to 770.17, 1,062.79 and 420.79 is: 580.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.17 : 1,062.79 = 420.79 : x
  2. Step 2: Convert to fraction form
    770.17/1,062.79 = 420.79/x
  3. Step 3: Cross multiply
    770.17x = 1,062.79 × 420.79
  4. Step 4: Simplify right side
    770.17x = 447,211.40
  5. Step 5: Solve for x
    x = 447,211.40/770.17
  6. Step 6: Final answer
    x = 580.67

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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.