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Finding the Fourth Proportional to 1,121.63, 1,547.85 and 624.34

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Solution

The fourth proportional to 1,121.63, 1,547.85 and 624.34 is: 861.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.63 : 1,547.85 = 624.34 : x
  2. Step 2: Convert to fraction form
    1,121.63/1,547.85 = 624.34/x
  3. Step 3: Cross multiply
    1,121.63x = 1,547.85 × 624.34
  4. Step 4: Simplify right side
    1,121.63x = 966,384.67
  5. Step 5: Solve for x
    x = 966,384.67/1,121.63
  6. Step 6: Final answer
    x = 861.59

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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.