Home / 85,721.14-128,519.42-35,815.51

Finding the Fourth Proportional to 85,721.14, 128,519.42 and 35,815.51

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Solution

The fourth proportional to 85,721.14, 128,519.42 and 35,815.51 is: 53,697.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,721.14 : 128,519.42 = 35,815.51 : x
  2. Step 2: Convert to fraction form
    85,721.14/128,519.42 = 35,815.51/x
  3. Step 3: Cross multiply
    85,721.14x = 128,519.42 × 35,815.51
  4. Step 4: Simplify right side
    85,721.14x = 4,602,988,572.20
  5. Step 5: Solve for x
    x = 4,602,988,572.20/85,721.14
  6. Step 6: Final answer
    x = 53,697.24

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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.