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Finding the Fourth Proportional to 28,608.79, 42,915.07 and 9,890.63

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Solution

The fourth proportional to 28,608.79, 42,915.07 and 9,890.63 is: 14,836.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,608.79 : 42,915.07 = 9,890.63 : x
  2. Step 2: Convert to fraction form
    28,608.79/42,915.07 = 9,890.63/x
  3. Step 3: Cross multiply
    28,608.79x = 42,915.07 × 9,890.63
  4. Step 4: Simplify right side
    28,608.79x = 424,457,161.36
  5. Step 5: Solve for x
    x = 424,457,161.36/28,608.79
  6. Step 6: Final answer
    x = 14,836.60

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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.