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Finding the Fourth Proportional to 991.37, 1,487.36 and 625.66

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Solution

The fourth proportional to 991.37, 1,487.36 and 625.66 is: 938.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.37 : 1,487.36 = 625.66 : x
  2. Step 2: Convert to fraction form
    991.37/1,487.36 = 625.66/x
  3. Step 3: Cross multiply
    991.37x = 1,487.36 × 625.66
  4. Step 4: Simplify right side
    991.37x = 930,579.50
  5. Step 5: Solve for x
    x = 930,579.50/991.37
  6. Step 6: Final answer
    x = 938.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.