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Finding the Fourth Proportional to 776.32, 1,070.72 and 499.84

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Solution

The fourth proportional to 776.32, 1,070.72 and 499.84 is: 689.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.32 : 1,070.72 = 499.84 : x
  2. Step 2: Convert to fraction form
    776.32/1,070.72 = 499.84/x
  3. Step 3: Cross multiply
    776.32x = 1,070.72 × 499.84
  4. Step 4: Simplify right side
    776.32x = 535,188.68
  5. Step 5: Solve for x
    x = 535,188.68/776.32
  6. Step 6: Final answer
    x = 689.39

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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.