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Finding the Fourth Proportional to 790.68, 1,090.89 and 624.36

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Solution

The fourth proportional to 790.68, 1,090.89 and 624.36 is: 861.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.68 : 1,090.89 = 624.36 : x
  2. Step 2: Convert to fraction form
    790.68/1,090.89 = 624.36/x
  3. Step 3: Cross multiply
    790.68x = 1,090.89 × 624.36
  4. Step 4: Simplify right side
    790.68x = 681,108.08
  5. Step 5: Solve for x
    x = 681,108.08/790.68
  6. Step 6: Final answer
    x = 861.42

Related Problems

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Half scale
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Double scale
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1.5x scale

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.