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Finding the Fourth Proportional to 991.84, 1,488.72 and 719.68

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Solution

The fourth proportional to 991.84, 1,488.72 and 719.68 is: 1,080.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.84 : 1,488.72 = 719.68 : x
  2. Step 2: Convert to fraction form
    991.84/1,488.72 = 719.68/x
  3. Step 3: Cross multiply
    991.84x = 1,488.72 × 719.68
  4. Step 4: Simplify right side
    991.84x = 1,071,402.01
  5. Step 5: Solve for x
    x = 1,071,402.01/991.84
  6. Step 6: Final answer
    x = 1,080.22

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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.