Home / 85,487.42-128,227.28-57,419.30

Finding the Fourth Proportional to 85,487.42, 128,227.28 and 57,419.30

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Solution

The fourth proportional to 85,487.42, 128,227.28 and 57,419.30 is: 86,126.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,487.42 : 128,227.28 = 57,419.30 : x
  2. Step 2: Convert to fraction form
    85,487.42/128,227.28 = 57,419.30/x
  3. Step 3: Cross multiply
    85,487.42x = 128,227.28 × 57,419.30
  4. Step 4: Simplify right side
    85,487.42x = 7,362,719,730.27
  5. Step 5: Solve for x
    x = 7,362,719,730.27/85,487.42
  6. Step 6: Final answer
    x = 86,126.36

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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.