Home / 21,543.36-29,720.70-13,155

Finding the Fourth Proportional to 21,543.36, 29,720.70 and 13,155

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Solution

The fourth proportional to 21,543.36, 29,720.70 and 13,155 is: 18,148.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,543.36 : 29,720.70 = 13,155 : x
  2. Step 2: Convert to fraction form
    21,543.36/29,720.70 = 13,155/x
  3. Step 3: Cross multiply
    21,543.36x = 29,720.70 × 13,155
  4. Step 4: Simplify right side
    21,543.36x = 390,975,808.50
  5. Step 5: Solve for x
    x = 390,975,808.50/21,543.36
  6. Step 6: Final answer
    x = 18,148.32

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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.