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Finding the Fourth Proportional to 922.79, 1,382.13 and 434.81

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Solution

The fourth proportional to 922.79, 1,382.13 and 434.81 is: 651.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.79 : 1,382.13 = 434.81 : x
  2. Step 2: Convert to fraction form
    922.79/1,382.13 = 434.81/x
  3. Step 3: Cross multiply
    922.79x = 1,382.13 × 434.81
  4. Step 4: Simplify right side
    922.79x = 600,967.40
  5. Step 5: Solve for x
    x = 600,967.40/922.79
  6. Step 6: Final answer
    x = 651.25

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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.