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Finding the Fourth Proportional to 1,035.25, 1,428.65 and 621.25

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Solution

The fourth proportional to 1,035.25, 1,428.65 and 621.25 is: 857.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.25 : 1,428.65 = 621.25 : x
  2. Step 2: Convert to fraction form
    1,035.25/1,428.65 = 621.25/x
  3. Step 3: Cross multiply
    1,035.25x = 1,428.65 × 621.25
  4. Step 4: Simplify right side
    1,035.25x = 887,545.71
  5. Step 5: Solve for x
    x = 887,545.71/1,035.25
  6. Step 6: Final answer
    x = 857.33

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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.