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Finding the Fourth Proportional to 770.81, 1,062.47 and 613.13

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Solution

The fourth proportional to 770.81, 1,062.47 and 613.13 is: 845.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.81 : 1,062.47 = 613.13 : x
  2. Step 2: Convert to fraction form
    770.81/1,062.47 = 613.13/x
  3. Step 3: Cross multiply
    770.81x = 1,062.47 × 613.13
  4. Step 4: Simplify right side
    770.81x = 651,428.45
  5. Step 5: Solve for x
    x = 651,428.45/770.81
  6. Step 6: Final answer
    x = 845.13

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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.