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Finding the Fourth Proportional to 786.16, 1,177.68 and 415.92

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Solution

The fourth proportional to 786.16, 1,177.68 and 415.92 is: 623.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.16 : 1,177.68 = 415.92 : x
  2. Step 2: Convert to fraction form
    786.16/1,177.68 = 415.92/x
  3. Step 3: Cross multiply
    786.16x = 1,177.68 × 415.92
  4. Step 4: Simplify right side
    786.16x = 489,820.67
  5. Step 5: Solve for x
    x = 489,820.67/786.16
  6. Step 6: Final answer
    x = 623.05

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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.