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Finding the Fourth Proportional to 12,505.76, 17,258.40 and 6,916.80

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Solution

The fourth proportional to 12,505.76, 17,258.40 and 6,916.80 is: 9,545.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,505.76 : 17,258.40 = 6,916.80 : x
  2. Step 2: Convert to fraction form
    12,505.76/17,258.40 = 6,916.80/x
  3. Step 3: Cross multiply
    12,505.76x = 17,258.40 × 6,916.80
  4. Step 4: Simplify right side
    12,505.76x = 119,372,901.12
  5. Step 5: Solve for x
    x = 119,372,901.12/12,505.76
  6. Step 6: Final answer
    x = 9,545.43

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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.