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Finding the Fourth Proportional to 28,411.90, 42,622.80 and 11,762.80

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Solution

The fourth proportional to 28,411.90, 42,622.80 and 11,762.80 is: 17,646.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,411.90 : 42,622.80 = 11,762.80 : x
  2. Step 2: Convert to fraction form
    28,411.90/42,622.80 = 11,762.80/x
  3. Step 3: Cross multiply
    28,411.90x = 42,622.80 × 11,762.80
  4. Step 4: Simplify right side
    28,411.90x = 501,363,471.84
  5. Step 5: Solve for x
    x = 501,363,471.84/28,411.90
  6. Step 6: Final answer
    x = 17,646.25

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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.