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Finding the Fourth Proportional to 798.40, 1,102.12 and 715.36

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Solution

The fourth proportional to 798.40, 1,102.12 and 715.36 is: 987.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.40 : 1,102.12 = 715.36 : x
  2. Step 2: Convert to fraction form
    798.40/1,102.12 = 715.36/x
  3. Step 3: Cross multiply
    798.40x = 1,102.12 × 715.36
  4. Step 4: Simplify right side
    798.40x = 788,412.56
  5. Step 5: Solve for x
    x = 788,412.56/798.40
  6. Step 6: Final answer
    x = 987.49

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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.