Home / 20,925.12-31,386.78-5,342.40

Finding the Fourth Proportional to 20,925.12, 31,386.78 and 5,342.40

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Solution

The fourth proportional to 20,925.12, 31,386.78 and 5,342.40 is: 8,013.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,925.12 : 31,386.78 = 5,342.40 : x
  2. Step 2: Convert to fraction form
    20,925.12/31,386.78 = 5,342.40/x
  3. Step 3: Cross multiply
    20,925.12x = 31,386.78 × 5,342.40
  4. Step 4: Simplify right side
    20,925.12x = 167,680,733.47
  5. Step 5: Solve for x
    x = 167,680,733.47/20,925.12
  6. Step 6: Final answer
    x = 8,013.37

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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.