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Finding the Fourth Proportional to 715.37, 987.16 and 400.58

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Solution

The fourth proportional to 715.37, 987.16 and 400.58 is: 552.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.37 : 987.16 = 400.58 : x
  2. Step 2: Convert to fraction form
    715.37/987.16 = 400.58/x
  3. Step 3: Cross multiply
    715.37x = 987.16 × 400.58
  4. Step 4: Simplify right side
    715.37x = 395,429.61
  5. Step 5: Solve for x
    x = 395,429.61/715.37
  6. Step 6: Final answer
    x = 552.77

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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.