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Finding the Fourth Proportional to 1,120.81, 1,681.02 and 340.62

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Solution

The fourth proportional to 1,120.81, 1,681.02 and 340.62 is: 510.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.81 : 1,681.02 = 340.62 : x
  2. Step 2: Convert to fraction form
    1,120.81/1,681.02 = 340.62/x
  3. Step 3: Cross multiply
    1,120.81x = 1,681.02 × 340.62
  4. Step 4: Simplify right side
    1,120.81x = 572,592.18
  5. Step 5: Solve for x
    x = 572,592.18/1,120.81
  6. Step 6: Final answer
    x = 510.87

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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.