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Finding the Fourth Proportional to 774.16, 1,068.38 and 479.60

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Solution

The fourth proportional to 774.16, 1,068.38 and 479.60 is: 661.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.16 : 1,068.38 = 479.60 : x
  2. Step 2: Convert to fraction form
    774.16/1,068.38 = 479.60/x
  3. Step 3: Cross multiply
    774.16x = 1,068.38 × 479.60
  4. Step 4: Simplify right side
    774.16x = 512,395.05
  5. Step 5: Solve for x
    x = 512,395.05/774.16
  6. Step 6: Final answer
    x = 661.87

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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.