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Finding the Fourth Proportional to 790.66, 1,186.08 and 425.38

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Solution

The fourth proportional to 790.66, 1,186.08 and 425.38 is: 638.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.66 : 1,186.08 = 425.38 : x
  2. Step 2: Convert to fraction form
    790.66/1,186.08 = 425.38/x
  3. Step 3: Cross multiply
    790.66x = 1,186.08 × 425.38
  4. Step 4: Simplify right side
    790.66x = 504,534.71
  5. Step 5: Solve for x
    x = 504,534.71/790.66
  6. Step 6: Final answer
    x = 638.12

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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.