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Finding the Fourth Proportional to 1,653.70, 2,478.80 and 542.82

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Solution

The fourth proportional to 1,653.70, 2,478.80 and 542.82 is: 813.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.70 : 2,478.80 = 542.82 : x
  2. Step 2: Convert to fraction form
    1,653.70/2,478.80 = 542.82/x
  3. Step 3: Cross multiply
    1,653.70x = 2,478.80 × 542.82
  4. Step 4: Simplify right side
    1,653.70x = 1,345,542.84
  5. Step 5: Solve for x
    x = 1,345,542.84/1,653.70
  6. Step 6: Final answer
    x = 813.66

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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.