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Finding the Fourth Proportional to 783.64, 1,081.40 and 434.32

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Solution

The fourth proportional to 783.64, 1,081.40 and 434.32 is: 599.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.64 : 1,081.40 = 434.32 : x
  2. Step 2: Convert to fraction form
    783.64/1,081.40 = 434.32/x
  3. Step 3: Cross multiply
    783.64x = 1,081.40 × 434.32
  4. Step 4: Simplify right side
    783.64x = 469,673.65
  5. Step 5: Solve for x
    x = 469,673.65/783.64
  6. Step 6: Final answer
    x = 599.35

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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.