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Finding the Fourth Proportional to 1,346.72, 2,019.72 and 615.92

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Solution

The fourth proportional to 1,346.72, 2,019.72 and 615.92 is: 923.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,346.72 : 2,019.72 = 615.92 : x
  2. Step 2: Convert to fraction form
    1,346.72/2,019.72 = 615.92/x
  3. Step 3: Cross multiply
    1,346.72x = 2,019.72 × 615.92
  4. Step 4: Simplify right side
    1,346.72x = 1,243,985.94
  5. Step 5: Solve for x
    x = 1,243,985.94/1,346.72
  6. Step 6: Final answer
    x = 923.72

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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.