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Finding the Fourth Proportional to 1,272.51, 1,908.87 and 542.10

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Solution

The fourth proportional to 1,272.51, 1,908.87 and 542.10 is: 813.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.51 : 1,908.87 = 542.10 : x
  2. Step 2: Convert to fraction form
    1,272.51/1,908.87 = 542.10/x
  3. Step 3: Cross multiply
    1,272.51x = 1,908.87 × 542.10
  4. Step 4: Simplify right side
    1,272.51x = 1,034,792.29
  5. Step 5: Solve for x
    x = 1,034,792.29/1,272.51
  6. Step 6: Final answer
    x = 813.19

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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.