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Finding the Fourth Proportional to 783.55, 1,081.19 and 434.19

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Solution

The fourth proportional to 783.55, 1,081.19 and 434.19 is: 599.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.55 : 1,081.19 = 434.19 : x
  2. Step 2: Convert to fraction form
    783.55/1,081.19 = 434.19/x
  3. Step 3: Cross multiply
    783.55x = 1,081.19 × 434.19
  4. Step 4: Simplify right side
    783.55x = 469,441.89
  5. Step 5: Solve for x
    x = 469,441.89/783.55
  6. Step 6: Final answer
    x = 599.12

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Double scale
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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.