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Finding the Fourth Proportional to 1,187.08, 1,637.94 and 715.24

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Solution

The fourth proportional to 1,187.08, 1,637.94 and 715.24 is: 986.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.08 : 1,637.94 = 715.24 : x
  2. Step 2: Convert to fraction form
    1,187.08/1,637.94 = 715.24/x
  3. Step 3: Cross multiply
    1,187.08x = 1,637.94 × 715.24
  4. Step 4: Simplify right side
    1,187.08x = 1,171,520.21
  5. Step 5: Solve for x
    x = 1,171,520.21/1,187.08
  6. Step 6: Final answer
    x = 986.89

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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.