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Finding the Fourth Proportional to 923.12, 1,384.66 and 435.90

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Solution

The fourth proportional to 923.12, 1,384.66 and 435.90 is: 653.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.12 : 1,384.66 = 435.90 : x
  2. Step 2: Convert to fraction form
    923.12/1,384.66 = 435.90/x
  3. Step 3: Cross multiply
    923.12x = 1,384.66 × 435.90
  4. Step 4: Simplify right side
    923.12x = 603,573.29
  5. Step 5: Solve for x
    x = 603,573.29/923.12
  6. Step 6: Final answer
    x = 653.84

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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.