Home / 1,325.10-1,987.47-459.12

Finding the Fourth Proportional to 1,325.10, 1,987.47 and 459.12

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Solution

The fourth proportional to 1,325.10, 1,987.47 and 459.12 is: 688.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.10 : 1,987.47 = 459.12 : x
  2. Step 2: Convert to fraction form
    1,325.10/1,987.47 = 459.12/x
  3. Step 3: Cross multiply
    1,325.10x = 1,987.47 × 459.12
  4. Step 4: Simplify right side
    1,325.10x = 912,487.23
  5. Step 5: Solve for x
    x = 912,487.23/1,325.10
  6. Step 6: Final answer
    x = 688.62

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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.