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Finding the Fourth Proportional to 12,916.80, 19,342.80 and 8,510.40

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Solution

The fourth proportional to 12,916.80, 19,342.80 and 8,510.40 is: 12,744.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,916.80 : 19,342.80 = 8,510.40 : x
  2. Step 2: Convert to fraction form
    12,916.80/19,342.80 = 8,510.40/x
  3. Step 3: Cross multiply
    12,916.80x = 19,342.80 × 8,510.40
  4. Step 4: Simplify right side
    12,916.80x = 164,614,965.12
  5. Step 5: Solve for x
    x = 164,614,965.12/12,916.80
  6. Step 6: Final answer
    x = 12,744.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.