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Finding the Fourth Proportional to 1,121.65, 1,547.91 and 624.33

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Solution

The fourth proportional to 1,121.65, 1,547.91 and 624.33 is: 861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.65 : 1,547.91 = 624.33 : x
  2. Step 2: Convert to fraction form
    1,121.65/1,547.91 = 624.33/x
  3. Step 3: Cross multiply
    1,121.65x = 1,547.91 × 624.33
  4. Step 4: Simplify right side
    1,121.65x = 966,406.65
  5. Step 5: Solve for x
    x = 966,406.65/1,121.65
  6. Step 6: Final answer
    x = 861.60

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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.