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Finding the Fourth Proportional to 783.65, 1,081.39 and 429.50

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Solution

The fourth proportional to 783.65, 1,081.39 and 429.50 is: 592.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.65 : 1,081.39 = 429.50 : x
  2. Step 2: Convert to fraction form
    783.65/1,081.39 = 429.50/x
  3. Step 3: Cross multiply
    783.65x = 1,081.39 × 429.50
  4. Step 4: Simplify right side
    783.65x = 464,452.15
  5. Step 5: Solve for x
    x = 464,452.15/783.65
  6. Step 6: Final answer
    x = 592.68

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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.