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Finding the Fourth Proportional to 929.20, 1,282.32 and 556.21

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Solution

The fourth proportional to 929.20, 1,282.32 and 556.21 is: 767.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.20 : 1,282.32 = 556.21 : x
  2. Step 2: Convert to fraction form
    929.20/1,282.32 = 556.21/x
  3. Step 3: Cross multiply
    929.20x = 1,282.32 × 556.21
  4. Step 4: Simplify right side
    929.20x = 713,239.21
  5. Step 5: Solve for x
    x = 713,239.21/929.20
  6. Step 6: Final answer
    x = 767.58

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1.5x scale

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.