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Finding the Fourth Proportional to 985.98, 1,360.65 and 587.91

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Solution

The fourth proportional to 985.98, 1,360.65 and 587.91 is: 811.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.98 : 1,360.65 = 587.91 : x
  2. Step 2: Convert to fraction form
    985.98/1,360.65 = 587.91/x
  3. Step 3: Cross multiply
    985.98x = 1,360.65 × 587.91
  4. Step 4: Simplify right side
    985.98x = 799,939.74
  5. Step 5: Solve for x
    x = 799,939.74/985.98
  6. Step 6: Final answer
    x = 811.31

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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.