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Finding the Fourth Proportional to 751.15, 1,125.68 and 385.16

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Solution

The fourth proportional to 751.15, 1,125.68 and 385.16 is: 577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.15 : 1,125.68 = 385.16 : x
  2. Step 2: Convert to fraction form
    751.15/1,125.68 = 385.16/x
  3. Step 3: Cross multiply
    751.15x = 1,125.68 × 385.16
  4. Step 4: Simplify right side
    751.15x = 433,566.91
  5. Step 5: Solve for x
    x = 433,566.91/751.15
  6. Step 6: Final answer
    x = 577.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.