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Finding the Fourth Proportional to 991.54, 1,487.99 and 529.65

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Solution

The fourth proportional to 991.54, 1,487.99 and 529.65 is: 794.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.54 : 1,487.99 = 529.65 : x
  2. Step 2: Convert to fraction form
    991.54/1,487.99 = 529.65/x
  3. Step 3: Cross multiply
    991.54x = 1,487.99 × 529.65
  4. Step 4: Simplify right side
    991.54x = 788,118.82
  5. Step 5: Solve for x
    x = 788,118.82/991.54
  6. Step 6: Final answer
    x = 794.84

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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.