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Finding the Fourth Proportional to 991.58, 1,484.30 and 528.22

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Solution

The fourth proportional to 991.58, 1,484.30 and 528.22 is: 790.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.58 : 1,484.30 = 528.22 : x
  2. Step 2: Convert to fraction form
    991.58/1,484.30 = 528.22/x
  3. Step 3: Cross multiply
    991.58x = 1,484.30 × 528.22
  4. Step 4: Simplify right side
    991.58x = 784,036.95
  5. Step 5: Solve for x
    x = 784,036.95/991.58
  6. Step 6: Final answer
    x = 790.69

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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.