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Finding the Fourth Proportional to 1,035.50, 1,428.99 and 621.50

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Solution

The fourth proportional to 1,035.50, 1,428.99 and 621.50 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.50 : 1,428.99 = 621.50 : x
  2. Step 2: Convert to fraction form
    1,035.50/1,428.99 = 621.50/x
  3. Step 3: Cross multiply
    1,035.50x = 1,428.99 × 621.50
  4. Step 4: Simplify right side
    1,035.50x = 888,117.29
  5. Step 5: Solve for x
    x = 888,117.29/1,035.50
  6. Step 6: Final answer
    x = 857.67

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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.