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Finding the Fourth Proportional to 985.77, 1,358.87 and 670.41

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Solution

The fourth proportional to 985.77, 1,358.87 and 670.41 is: 924.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.77 : 1,358.87 = 670.41 : x
  2. Step 2: Convert to fraction form
    985.77/1,358.87 = 670.41/x
  3. Step 3: Cross multiply
    985.77x = 1,358.87 × 670.41
  4. Step 4: Simplify right side
    985.77x = 910,996.68
  5. Step 5: Solve for x
    x = 910,996.68/985.77
  6. Step 6: Final answer
    x = 924.15

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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.