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Finding the Fourth Proportional to 1,035.26, 1,428.57 and 642.30

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Solution

The fourth proportional to 1,035.26, 1,428.57 and 642.30 is: 886.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.26 : 1,428.57 = 642.30 : x
  2. Step 2: Convert to fraction form
    1,035.26/1,428.57 = 642.30/x
  3. Step 3: Cross multiply
    1,035.26x = 1,428.57 × 642.30
  4. Step 4: Simplify right side
    1,035.26x = 917,570.51
  5. Step 5: Solve for x
    x = 917,570.51/1,035.26
  6. Step 6: Final answer
    x = 886.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.