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Finding the Fourth Proportional to 922.29, 1,272.78 and 502.65

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Solution

The fourth proportional to 922.29, 1,272.78 and 502.65 is: 693.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.29 : 1,272.78 = 502.65 : x
  2. Step 2: Convert to fraction form
    922.29/1,272.78 = 502.65/x
  3. Step 3: Cross multiply
    922.29x = 1,272.78 × 502.65
  4. Step 4: Simplify right side
    922.29x = 639,762.87
  5. Step 5: Solve for x
    x = 639,762.87/922.29
  6. Step 6: Final answer
    x = 693.67

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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.