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Finding the Fourth Proportional to 929.87, 1,283.36 and 556.86

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Solution

The fourth proportional to 929.87, 1,283.36 and 556.86 is: 768.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.87 : 1,283.36 = 556.86 : x
  2. Step 2: Convert to fraction form
    929.87/1,283.36 = 556.86/x
  3. Step 3: Cross multiply
    929.87x = 1,283.36 × 556.86
  4. Step 4: Simplify right side
    929.87x = 714,649.07
  5. Step 5: Solve for x
    x = 714,649.07/929.87
  6. Step 6: Final answer
    x = 768.55

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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.