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Finding the Fourth Proportional to 783.53, 1,081.25 and 434.21

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Solution

The fourth proportional to 783.53, 1,081.25 and 434.21 is: 599.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.53 : 1,081.25 = 434.21 : x
  2. Step 2: Convert to fraction form
    783.53/1,081.25 = 434.21/x
  3. Step 3: Cross multiply
    783.53x = 1,081.25 × 434.21
  4. Step 4: Simplify right side
    783.53x = 469,490.09
  5. Step 5: Solve for x
    x = 469,490.09/783.53
  6. Step 6: Final answer
    x = 599.20

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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.