Home / 8,921.86-12,312-5,385.22

Finding the Fourth Proportional to 8,921.86, 12,312 and 5,385.22

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Solution

The fourth proportional to 8,921.86, 12,312 and 5,385.22 is: 7,431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.86 : 12,312 = 5,385.22 : x
  2. Step 2: Convert to fraction form
    8,921.86/12,312 = 5,385.22/x
  3. Step 3: Cross multiply
    8,921.86x = 12,312 × 5,385.22
  4. Step 4: Simplify right side
    8,921.86x = 66,302,828.64
  5. Step 5: Solve for x
    x = 66,302,828.64/8,921.86
  6. Step 6: Final answer
    x = 7,431.50

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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.