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Finding the Fourth Proportional to 1,315.16, 1,814.94 and 725.72

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Solution

The fourth proportional to 1,315.16, 1,814.94 and 725.72 is: 1,001.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.16 : 1,814.94 = 725.72 : x
  2. Step 2: Convert to fraction form
    1,315.16/1,814.94 = 725.72/x
  3. Step 3: Cross multiply
    1,315.16x = 1,814.94 × 725.72
  4. Step 4: Simplify right side
    1,315.16x = 1,317,138.26
  5. Step 5: Solve for x
    x = 1,317,138.26/1,315.16
  6. Step 6: Final answer
    x = 1,001.50

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1.5x scale

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.