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Finding the Fourth Proportional to 785.70, 1,178.56 and 542.16

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Solution

The fourth proportional to 785.70, 1,178.56 and 542.16 is: 813.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.70 : 1,178.56 = 542.16 : x
  2. Step 2: Convert to fraction form
    785.70/1,178.56 = 542.16/x
  3. Step 3: Cross multiply
    785.70x = 1,178.56 × 542.16
  4. Step 4: Simplify right side
    785.70x = 638,968.09
  5. Step 5: Solve for x
    x = 638,968.09/785.70
  6. Step 6: Final answer
    x = 813.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.