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Finding the Fourth Proportional to 783.86, 1,081.72 and 452.28

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Solution

The fourth proportional to 783.86, 1,081.72 and 452.28 is: 624.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.86 : 1,081.72 = 452.28 : x
  2. Step 2: Convert to fraction form
    783.86/1,081.72 = 452.28/x
  3. Step 3: Cross multiply
    783.86x = 1,081.72 × 452.28
  4. Step 4: Simplify right side
    783.86x = 489,240.32
  5. Step 5: Solve for x
    x = 489,240.32/783.86
  6. Step 6: Final answer
    x = 624.14

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1.5x scale

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.