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Finding the Fourth Proportional to 91,409.78, 137,113.23 and 66,607.22

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Solution

The fourth proportional to 91,409.78, 137,113.23 and 66,607.22 is: 99,909.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,409.78 : 137,113.23 = 66,607.22 : x
  2. Step 2: Convert to fraction form
    91,409.78/137,113.23 = 66,607.22/x
  3. Step 3: Cross multiply
    91,409.78x = 137,113.23 × 66,607.22
  4. Step 4: Simplify right side
    91,409.78x = 9,132,731,075.52
  5. Step 5: Solve for x
    x = 9,132,731,075.52/91,409.78
  6. Step 6: Final answer
    x = 99,909.78

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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.