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Finding the Fourth Proportional to 783.76, 1,081.74 and 452.40

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Solution

The fourth proportional to 783.76, 1,081.74 and 452.40 is: 624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.76 : 1,081.74 = 452.40 : x
  2. Step 2: Convert to fraction form
    783.76/1,081.74 = 452.40/x
  3. Step 3: Cross multiply
    783.76x = 1,081.74 × 452.40
  4. Step 4: Simplify right side
    783.76x = 489,379.18
  5. Step 5: Solve for x
    x = 489,379.18/783.76
  6. Step 6: Final answer
    x = 624.40

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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.