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Finding the Fourth Proportional to 1,121.84, 1,681.80 and 545.12

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Solution

The fourth proportional to 1,121.84, 1,681.80 and 545.12 is: 817.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.84 : 1,681.80 = 545.12 : x
  2. Step 2: Convert to fraction form
    1,121.84/1,681.80 = 545.12/x
  3. Step 3: Cross multiply
    1,121.84x = 1,681.80 × 545.12
  4. Step 4: Simplify right side
    1,121.84x = 916,782.82
  5. Step 5: Solve for x
    x = 916,782.82/1,121.84
  6. Step 6: Final answer
    x = 817.21

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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.