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Finding the Fourth Proportional to 1,107.12, 1,661.76 and 529.92

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Solution

The fourth proportional to 1,107.12, 1,661.76 and 529.92 is: 795.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.12 : 1,661.76 = 529.92 : x
  2. Step 2: Convert to fraction form
    1,107.12/1,661.76 = 529.92/x
  3. Step 3: Cross multiply
    1,107.12x = 1,661.76 × 529.92
  4. Step 4: Simplify right side
    1,107.12x = 880,599.86
  5. Step 5: Solve for x
    x = 880,599.86/1,107.12
  6. Step 6: Final answer
    x = 795.40

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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.