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Finding the Fourth Proportional to 1,638.71, 2,457.55 and 542.85

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Solution

The fourth proportional to 1,638.71, 2,457.55 and 542.85 is: 814.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.71 : 2,457.55 = 542.85 : x
  2. Step 2: Convert to fraction form
    1,638.71/2,457.55 = 542.85/x
  3. Step 3: Cross multiply
    1,638.71x = 2,457.55 × 542.85
  4. Step 4: Simplify right side
    1,638.71x = 1,334,081.02
  5. Step 5: Solve for x
    x = 1,334,081.02/1,638.71
  6. Step 6: Final answer
    x = 814.10

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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.