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Finding the Fourth Proportional to 1,120.72, 1,681.32 and 340.71

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Solution

The fourth proportional to 1,120.72, 1,681.32 and 340.71 is: 511.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.72 : 1,681.32 = 340.71 : x
  2. Step 2: Convert to fraction form
    1,120.72/1,681.32 = 340.71/x
  3. Step 3: Cross multiply
    1,120.72x = 1,681.32 × 340.71
  4. Step 4: Simplify right side
    1,120.72x = 572,842.54
  5. Step 5: Solve for x
    x = 572,842.54/1,120.72
  6. Step 6: Final answer
    x = 511.14

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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.