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Finding the Fourth Proportional to 931.68, 1,285.08 and 666.12

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Solution

The fourth proportional to 931.68, 1,285.08 and 666.12 is: 918.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.68 : 1,285.08 = 666.12 : x
  2. Step 2: Convert to fraction form
    931.68/1,285.08 = 666.12/x
  3. Step 3: Cross multiply
    931.68x = 1,285.08 × 666.12
  4. Step 4: Simplify right side
    931.68x = 856,017.49
  5. Step 5: Solve for x
    x = 856,017.49/931.68
  6. Step 6: Final answer
    x = 918.79

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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.