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Finding the Fourth Proportional to 1,121.45, 1,547.51 and 624.05

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Solution

The fourth proportional to 1,121.45, 1,547.51 and 624.05 is: 861.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.45 : 1,547.51 = 624.05 : x
  2. Step 2: Convert to fraction form
    1,121.45/1,547.51 = 624.05/x
  3. Step 3: Cross multiply
    1,121.45x = 1,547.51 × 624.05
  4. Step 4: Simplify right side
    1,121.45x = 965,723.62
  5. Step 5: Solve for x
    x = 965,723.62/1,121.45
  6. Step 6: Final answer
    x = 861.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.