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Finding the Fourth Proportional to 861.75, 1,188.99 and 507.60

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Solution

The fourth proportional to 861.75, 1,188.99 and 507.60 is: 700.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.75 : 1,188.99 = 507.60 : x
  2. Step 2: Convert to fraction form
    861.75/1,188.99 = 507.60/x
  3. Step 3: Cross multiply
    861.75x = 1,188.99 × 507.60
  4. Step 4: Simplify right side
    861.75x = 603,531.32
  5. Step 5: Solve for x
    x = 603,531.32/861.75
  6. Step 6: Final answer
    x = 700.36

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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.