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Finding the Fourth Proportional to 991.95, 1,488.09 and 342.51

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Solution

The fourth proportional to 991.95, 1,488.09 and 342.51 is: 513.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.95 : 1,488.09 = 342.51 : x
  2. Step 2: Convert to fraction form
    991.95/1,488.09 = 342.51/x
  3. Step 3: Cross multiply
    991.95x = 1,488.09 × 342.51
  4. Step 4: Simplify right side
    991.95x = 509,685.71
  5. Step 5: Solve for x
    x = 509,685.71/991.95
  6. Step 6: Final answer
    x = 513.82

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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.