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Finding the Fourth Proportional to 1,008.79, 1,390.64 and 693.56

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Solution

The fourth proportional to 1,008.79, 1,390.64 and 693.56 is: 956.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.79 : 1,390.64 = 693.56 : x
  2. Step 2: Convert to fraction form
    1,008.79/1,390.64 = 693.56/x
  3. Step 3: Cross multiply
    1,008.79x = 1,390.64 × 693.56
  4. Step 4: Simplify right side
    1,008.79x = 964,492.29
  5. Step 5: Solve for x
    x = 964,492.29/1,008.79
  6. Step 6: Final answer
    x = 956.09

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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.