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Finding the Fourth Proportional to 1,242.79, 1,715.36 and 711.84

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Solution

The fourth proportional to 1,242.79, 1,715.36 and 711.84 is: 982.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.79 : 1,715.36 = 711.84 : x
  2. Step 2: Convert to fraction form
    1,242.79/1,715.36 = 711.84/x
  3. Step 3: Cross multiply
    1,242.79x = 1,715.36 × 711.84
  4. Step 4: Simplify right side
    1,242.79x = 1,221,069.67
  5. Step 5: Solve for x
    x = 1,221,069.67/1,242.79
  6. Step 6: Final answer
    x = 982.52

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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.