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Finding the Fourth Proportional to 12,509.84, 18,765.28 and 8,130.40

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Solution

The fourth proportional to 12,509.84, 18,765.28 and 8,130.40 is: 12,195.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,509.84 : 18,765.28 = 8,130.40 : x
  2. Step 2: Convert to fraction form
    12,509.84/18,765.28 = 8,130.40/x
  3. Step 3: Cross multiply
    12,509.84x = 18,765.28 × 8,130.40
  4. Step 4: Simplify right side
    12,509.84x = 152,569,232.51
  5. Step 5: Solve for x
    x = 152,569,232.51/12,509.84
  6. Step 6: Final answer
    x = 12,195.94

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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.