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Finding the Fourth Proportional to 91,084.80, 136,918.80 and 64,970.40

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Solution

The fourth proportional to 91,084.80, 136,918.80 and 64,970.40 is: 97,663.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,084.80 : 136,918.80 = 64,970.40 : x
  2. Step 2: Convert to fraction form
    91,084.80/136,918.80 = 64,970.40/x
  3. Step 3: Cross multiply
    91,084.80x = 136,918.80 × 64,970.40
  4. Step 4: Simplify right side
    91,084.80x = 8,895,669,203.52
  5. Step 5: Solve for x
    x = 8,895,669,203.52/91,084.80
  6. Step 6: Final answer
    x = 97,663.60

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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.