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Finding the Fourth Proportional to 1,118.50, 1,543.52 and 646.22

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Solution

The fourth proportional to 1,118.50, 1,543.52 and 646.22 is: 891.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.50 : 1,543.52 = 646.22 : x
  2. Step 2: Convert to fraction form
    1,118.50/1,543.52 = 646.22/x
  3. Step 3: Cross multiply
    1,118.50x = 1,543.52 × 646.22
  4. Step 4: Simplify right side
    1,118.50x = 997,446.40
  5. Step 5: Solve for x
    x = 997,446.40/1,118.50
  6. Step 6: Final answer
    x = 891.77

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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.