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Finding the Fourth Proportional to 1,202.79, 1,660.01 and 678.99

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Solution

The fourth proportional to 1,202.79, 1,660.01 and 678.99 is: 937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.79 : 1,660.01 = 678.99 : x
  2. Step 2: Convert to fraction form
    1,202.79/1,660.01 = 678.99/x
  3. Step 3: Cross multiply
    1,202.79x = 1,660.01 × 678.99
  4. Step 4: Simplify right side
    1,202.79x = 1,127,130.19
  5. Step 5: Solve for x
    x = 1,127,130.19/1,202.79
  6. Step 6: Final answer
    x = 937.10

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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.