Home / 1,149.20-1,720.13-915.45

Finding the Fourth Proportional to 1,149.20, 1,720.13 and 915.45

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Solution

The fourth proportional to 1,149.20, 1,720.13 and 915.45 is: 1,370.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.20 : 1,720.13 = 915.45 : x
  2. Step 2: Convert to fraction form
    1,149.20/1,720.13 = 915.45/x
  3. Step 3: Cross multiply
    1,149.20x = 1,720.13 × 915.45
  4. Step 4: Simplify right side
    1,149.20x = 1,574,688.43
  5. Step 5: Solve for x
    x = 1,574,688.43/1,149.20
  6. Step 6: Final answer
    x = 1,370.25

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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.