Home / 42,720.49-64,081.78-13,138.55

Finding the Fourth Proportional to 42,720.49, 64,081.78 and 13,138.55

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Solution

The fourth proportional to 42,720.49, 64,081.78 and 13,138.55 is: 19,708.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,720.49 : 64,081.78 = 13,138.55 : x
  2. Step 2: Convert to fraction form
    42,720.49/64,081.78 = 13,138.55/x
  3. Step 3: Cross multiply
    42,720.49x = 64,081.78 × 13,138.55
  4. Step 4: Simplify right side
    42,720.49x = 841,941,317.36
  5. Step 5: Solve for x
    x = 841,941,317.36/42,720.49
  6. Step 6: Final answer
    x = 19,708.14

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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.