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Finding the Fourth Proportional to 1,186.32, 1,636.80 and 720.24

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Solution

The fourth proportional to 1,186.32, 1,636.80 and 720.24 is: 993.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.32 : 1,636.80 = 720.24 : x
  2. Step 2: Convert to fraction form
    1,186.32/1,636.80 = 720.24/x
  3. Step 3: Cross multiply
    1,186.32x = 1,636.80 × 720.24
  4. Step 4: Simplify right side
    1,186.32x = 1,178,888.83
  5. Step 5: Solve for x
    x = 1,178,888.83/1,186.32
  6. Step 6: Final answer
    x = 993.74

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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.