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Finding the Fourth Proportional to 28,638.55, 42,947.52 and 9,913.50

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Solution

The fourth proportional to 28,638.55, 42,947.52 and 9,913.50 is: 14,866.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.55 : 42,947.52 = 9,913.50 : x
  2. Step 2: Convert to fraction form
    28,638.55/42,947.52 = 9,913.50/x
  3. Step 3: Cross multiply
    28,638.55x = 42,947.52 × 9,913.50
  4. Step 4: Simplify right side
    28,638.55x = 425,760,239.52
  5. Step 5: Solve for x
    x = 425,760,239.52/28,638.55
  6. Step 6: Final answer
    x = 14,866.68

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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.