Home / 42,720.30-64,081.46-13,138.40

Finding the Fourth Proportional to 42,720.30, 64,081.46 and 13,138.40

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Solution

The fourth proportional to 42,720.30, 64,081.46 and 13,138.40 is: 19,707.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,720.30 : 64,081.46 = 13,138.40 : x
  2. Step 2: Convert to fraction form
    42,720.30/64,081.46 = 13,138.40/x
  3. Step 3: Cross multiply
    42,720.30x = 64,081.46 × 13,138.40
  4. Step 4: Simplify right side
    42,720.30x = 841,928,047.11
  5. Step 5: Solve for x
    x = 841,928,047.11/42,720.30
  6. Step 6: Final answer
    x = 19,707.92

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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.