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Finding the Fourth Proportional to 99,968.80, 149,780.40 and 64,890.40

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Solution

The fourth proportional to 99,968.80, 149,780.40 and 64,890.40 is: 97,223.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,968.80 : 149,780.40 = 64,890.40 : x
  2. Step 2: Convert to fraction form
    99,968.80/149,780.40 = 64,890.40/x
  3. Step 3: Cross multiply
    99,968.80x = 149,780.40 × 64,890.40
  4. Step 4: Simplify right side
    99,968.80x = 9,719,310,068.16
  5. Step 5: Solve for x
    x = 9,719,310,068.16/99,968.80
  6. Step 6: Final answer
    x = 97,223.43

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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.