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Finding the Fourth Proportional to 985.44, 1,360.32 and 672.32

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Solution

The fourth proportional to 985.44, 1,360.32 and 672.32 is: 928.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.44 : 1,360.32 = 672.32 : x
  2. Step 2: Convert to fraction form
    985.44/1,360.32 = 672.32/x
  3. Step 3: Cross multiply
    985.44x = 1,360.32 × 672.32
  4. Step 4: Simplify right side
    985.44x = 914,570.34
  5. Step 5: Solve for x
    x = 914,570.34/985.44
  6. Step 6: Final answer
    x = 928.08

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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.