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Finding the Fourth Proportional to 26,638.94, 39,947.95 and 9,989.90

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Solution

The fourth proportional to 26,638.94, 39,947.95 and 9,989.90 is: 14,980.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,638.94 : 39,947.95 = 9,989.90 : x
  2. Step 2: Convert to fraction form
    26,638.94/39,947.95 = 9,989.90/x
  3. Step 3: Cross multiply
    26,638.94x = 39,947.95 × 9,989.90
  4. Step 4: Simplify right side
    26,638.94x = 399,075,988.26
  5. Step 5: Solve for x
    x = 399,075,988.26/26,638.94
  6. Step 6: Final answer
    x = 14,980.92

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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.