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Finding the Fourth Proportional to 786.46, 1,085.32 and 432.39

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Solution

The fourth proportional to 786.46, 1,085.32 and 432.39 is: 596.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.46 : 1,085.32 = 432.39 : x
  2. Step 2: Convert to fraction form
    786.46/1,085.32 = 432.39/x
  3. Step 3: Cross multiply
    786.46x = 1,085.32 × 432.39
  4. Step 4: Simplify right side
    786.46x = 469,281.51
  5. Step 5: Solve for x
    x = 469,281.51/786.46
  6. Step 6: Final answer
    x = 596.70

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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.