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Finding the Fourth Proportional to 28,577.40, 42,914.70 and 21,190.20

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Solution

The fourth proportional to 28,577.40, 42,914.70 and 21,190.20 is: 31,821.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,577.40 : 42,914.70 = 21,190.20 : x
  2. Step 2: Convert to fraction form
    28,577.40/42,914.70 = 21,190.20/x
  3. Step 3: Cross multiply
    28,577.40x = 42,914.70 × 21,190.20
  4. Step 4: Simplify right side
    28,577.40x = 909,371,075.94
  5. Step 5: Solve for x
    x = 909,371,075.94/28,577.40
  6. Step 6: Final answer
    x = 31,821.34

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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.