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Finding the Fourth Proportional to 783.45, 1,081.16 and 429.38

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Solution

The fourth proportional to 783.45, 1,081.16 and 429.38 is: 592.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.45 : 1,081.16 = 429.38 : x
  2. Step 2: Convert to fraction form
    783.45/1,081.16 = 429.38/x
  3. Step 3: Cross multiply
    783.45x = 1,081.16 × 429.38
  4. Step 4: Simplify right side
    783.45x = 464,224.16
  5. Step 5: Solve for x
    x = 464,224.16/783.45
  6. Step 6: Final answer
    x = 592.54

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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.