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Finding the Fourth Proportional to 785.55, 1,084.08 and 431.50

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Solution

The fourth proportional to 785.55, 1,084.08 and 431.50 is: 595.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.55 : 1,084.08 = 431.50 : x
  2. Step 2: Convert to fraction form
    785.55/1,084.08 = 431.50/x
  3. Step 3: Cross multiply
    785.55x = 1,084.08 × 431.50
  4. Step 4: Simplify right side
    785.55x = 467,784.51
  5. Step 5: Solve for x
    x = 467,784.51/785.55
  6. Step 6: Final answer
    x = 595.49

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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.