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Finding the Fourth Proportional to 991.60, 1,486.98 and 529.28

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Solution

The fourth proportional to 991.60, 1,486.98 and 529.28 is: 793.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.60 : 1,486.98 = 529.28 : x
  2. Step 2: Convert to fraction form
    991.60/1,486.98 = 529.28/x
  3. Step 3: Cross multiply
    991.60x = 1,486.98 × 529.28
  4. Step 4: Simplify right side
    991.60x = 787,028.77
  5. Step 5: Solve for x
    x = 787,028.77/991.60
  6. Step 6: Final answer
    x = 793.70

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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.