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Finding the Fourth Proportional to 103,191.99, 142,344.45 and 64,890.78

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Solution

The fourth proportional to 103,191.99, 142,344.45 and 64,890.78 is: 89,511.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,191.99 : 142,344.45 = 64,890.78 : x
  2. Step 2: Convert to fraction form
    103,191.99/142,344.45 = 64,890.78/x
  3. Step 3: Cross multiply
    103,191.99x = 142,344.45 × 64,890.78
  4. Step 4: Simplify right side
    103,191.99x = 9,236,842,389.17
  5. Step 5: Solve for x
    x = 9,236,842,389.17/103,191.99
  6. Step 6: Final answer
    x = 89,511.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.