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Finding the Fourth Proportional to 751.45, 1,125.83 and 643.45

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Solution

The fourth proportional to 751.45, 1,125.83 and 643.45 is: 964.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.45 : 1,125.83 = 643.45 : x
  2. Step 2: Convert to fraction form
    751.45/1,125.83 = 643.45/x
  3. Step 3: Cross multiply
    751.45x = 1,125.83 × 643.45
  4. Step 4: Simplify right side
    751.45x = 724,412.10
  5. Step 5: Solve for x
    x = 724,412.10/751.45
  6. Step 6: Final answer
    x = 964.02

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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.