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Finding the Fourth Proportional to 13,888.76, 19,167.02 and 7,921.40

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Solution

The fourth proportional to 13,888.76, 19,167.02 and 7,921.40 is: 10,931.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,888.76 : 19,167.02 = 7,921.40 : x
  2. Step 2: Convert to fraction form
    13,888.76/19,167.02 = 7,921.40/x
  3. Step 3: Cross multiply
    13,888.76x = 19,167.02 × 7,921.40
  4. Step 4: Simplify right side
    13,888.76x = 151,829,632.23
  5. Step 5: Solve for x
    x = 151,829,632.23/13,888.76
  6. Step 6: Final answer
    x = 10,931.83

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1.5x scale

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.