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Finding the Fourth Proportional to 978.87, 1,350.84 and 530.75

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Solution

The fourth proportional to 978.87, 1,350.84 and 530.75 is: 732.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.87 : 1,350.84 = 530.75 : x
  2. Step 2: Convert to fraction form
    978.87/1,350.84 = 530.75/x
  3. Step 3: Cross multiply
    978.87x = 1,350.84 × 530.75
  4. Step 4: Simplify right side
    978.87x = 716,958.33
  5. Step 5: Solve for x
    x = 716,958.33/978.87
  6. Step 6: Final answer
    x = 732.43

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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.