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Finding the Fourth Proportional to 784.53, 1,180.56 and 646.70

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Solution

The fourth proportional to 784.53, 1,180.56 and 646.70 is: 973.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.53 : 1,180.56 = 646.70 : x
  2. Step 2: Convert to fraction form
    784.53/1,180.56 = 646.70/x
  3. Step 3: Cross multiply
    784.53x = 1,180.56 × 646.70
  4. Step 4: Simplify right side
    784.53x = 763,468.15
  5. Step 5: Solve for x
    x = 763,468.15/784.53
  6. Step 6: Final answer
    x = 973.15

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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.