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Finding the Fourth Proportional to 28,615.28, 42,916.36 and 7,840.40

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Solution

The fourth proportional to 28,615.28, 42,916.36 and 7,840.40 is: 11,758.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,615.28 : 42,916.36 = 7,840.40 : x
  2. Step 2: Convert to fraction form
    28,615.28/42,916.36 = 7,840.40/x
  3. Step 3: Cross multiply
    28,615.28x = 42,916.36 × 7,840.40
  4. Step 4: Simplify right side
    28,615.28x = 336,481,428.94
  5. Step 5: Solve for x
    x = 336,481,428.94/28,615.28
  6. Step 6: Final answer
    x = 11,758.80

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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.