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Finding the Fourth Proportional to 918.81, 1,372.68 and 732.51

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Solution

The fourth proportional to 918.81, 1,372.68 and 732.51 is: 1,094.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.81 : 1,372.68 = 732.51 : x
  2. Step 2: Convert to fraction form
    918.81/1,372.68 = 732.51/x
  3. Step 3: Cross multiply
    918.81x = 1,372.68 × 732.51
  4. Step 4: Simplify right side
    918.81x = 1,005,501.83
  5. Step 5: Solve for x
    x = 1,005,501.83/918.81
  6. Step 6: Final answer
    x = 1,094.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.