Home / 13,931.36-19,221.95-7,881.72

Finding the Fourth Proportional to 13,931.36, 19,221.95 and 7,881.72

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Solution

The fourth proportional to 13,931.36, 19,221.95 and 7,881.72 is: 10,874.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,931.36 : 19,221.95 = 7,881.72 : x
  2. Step 2: Convert to fraction form
    13,931.36/19,221.95 = 7,881.72/x
  3. Step 3: Cross multiply
    13,931.36x = 19,221.95 × 7,881.72
  4. Step 4: Simplify right side
    13,931.36x = 151,501,988.35
  5. Step 5: Solve for x
    x = 151,501,988.35/13,931.36
  6. Step 6: Final answer
    x = 10,874.89

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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.