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Finding the Fourth Proportional to 69,075.40, 103,689.90 and 42,809.80

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Solution

The fourth proportional to 69,075.40, 103,689.90 and 42,809.80 is: 64,262.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,075.40 : 103,689.90 = 42,809.80 : x
  2. Step 2: Convert to fraction form
    69,075.40/103,689.90 = 42,809.80/x
  3. Step 3: Cross multiply
    69,075.40x = 103,689.90 × 42,809.80
  4. Step 4: Simplify right side
    69,075.40x = 4,438,943,881.02
  5. Step 5: Solve for x
    x = 4,438,943,881.02/69,075.40
  6. Step 6: Final answer
    x = 64,262.30

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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.