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Finding the Fourth Proportional to 985.02, 1,358.82 and 689.64

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Solution

The fourth proportional to 985.02, 1,358.82 and 689.64 is: 951.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.02 : 1,358.82 = 689.64 : x
  2. Step 2: Convert to fraction form
    985.02/1,358.82 = 689.64/x
  3. Step 3: Cross multiply
    985.02x = 1,358.82 × 689.64
  4. Step 4: Simplify right side
    985.02x = 937,096.62
  5. Step 5: Solve for x
    x = 937,096.62/985.02
  6. Step 6: Final answer
    x = 951.35

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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.