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Finding the Fourth Proportional to 1,118.32, 1,543.50 and 646.26

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Solution

The fourth proportional to 1,118.32, 1,543.50 and 646.26 is: 891.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.32 : 1,543.50 = 646.26 : x
  2. Step 2: Convert to fraction form
    1,118.32/1,543.50 = 646.26/x
  3. Step 3: Cross multiply
    1,118.32x = 1,543.50 × 646.26
  4. Step 4: Simplify right side
    1,118.32x = 997,502.31
  5. Step 5: Solve for x
    x = 997,502.31/1,118.32
  6. Step 6: Final answer
    x = 891.97

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Double scale
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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.