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Finding the Fourth Proportional to 861.30, 1,188.63 and 507.47

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Solution

The fourth proportional to 861.30, 1,188.63 and 507.47 is: 700.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.30 : 1,188.63 = 507.47 : x
  2. Step 2: Convert to fraction form
    861.30/1,188.63 = 507.47/x
  3. Step 3: Cross multiply
    861.30x = 1,188.63 × 507.47
  4. Step 4: Simplify right side
    861.30x = 603,188.12
  5. Step 5: Solve for x
    x = 603,188.12/861.30
  6. Step 6: Final answer
    x = 700.32

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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.