Home / 1,415.07-2,123.01-721.17

Finding the Fourth Proportional to 1,415.07, 2,123.01 and 721.17

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Solution

The fourth proportional to 1,415.07, 2,123.01 and 721.17 is: 1,081.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.07 : 2,123.01 = 721.17 : x
  2. Step 2: Convert to fraction form
    1,415.07/2,123.01 = 721.17/x
  3. Step 3: Cross multiply
    1,415.07x = 2,123.01 × 721.17
  4. Step 4: Simplify right side
    1,415.07x = 1,531,051.12
  5. Step 5: Solve for x
    x = 1,531,051.12/1,415.07
  6. Step 6: Final answer
    x = 1,081.96

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1.5x scale

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.