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Finding the Fourth Proportional to 112,720.78, 155,554.68 and 62,419.78

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Solution

The fourth proportional to 112,720.78, 155,554.68 and 62,419.78 is: 86,139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,720.78 : 155,554.68 = 62,419.78 : x
  2. Step 2: Convert to fraction form
    112,720.78/155,554.68 = 62,419.78/x
  3. Step 3: Cross multiply
    112,720.78x = 155,554.68 × 62,419.78
  4. Step 4: Simplify right side
    112,720.78x = 9,709,688,903.57
  5. Step 5: Solve for x
    x = 9,709,688,903.57/112,720.78
  6. Step 6: Final answer
    x = 86,139.30

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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.