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Finding the Fourth Proportional to 1,181.04, 1,628.64 and 715.20

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Solution

The fourth proportional to 1,181.04, 1,628.64 and 715.20 is: 986.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.04 : 1,628.64 = 715.20 : x
  2. Step 2: Convert to fraction form
    1,181.04/1,628.64 = 715.20/x
  3. Step 3: Cross multiply
    1,181.04x = 1,628.64 × 715.20
  4. Step 4: Simplify right side
    1,181.04x = 1,164,803.33
  5. Step 5: Solve for x
    x = 1,164,803.33/1,181.04
  6. Step 6: Final answer
    x = 986.25

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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.