Home / 13,128.84-18,117.95-7,160.49

Finding the Fourth Proportional to 13,128.84, 18,117.95 and 7,160.49

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Solution

The fourth proportional to 13,128.84, 18,117.95 and 7,160.49 is: 9,881.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.84 : 18,117.95 = 7,160.49 : x
  2. Step 2: Convert to fraction form
    13,128.84/18,117.95 = 7,160.49/x
  3. Step 3: Cross multiply
    13,128.84x = 18,117.95 × 7,160.49
  4. Step 4: Simplify right side
    13,128.84x = 129,733,363.99
  5. Step 5: Solve for x
    x = 129,733,363.99/13,128.84
  6. Step 6: Final answer
    x = 9,881.56

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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.