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Finding the Fourth Proportional to 103,589.55, 142,985.66 and 79,688.07

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Solution

The fourth proportional to 103,589.55, 142,985.66 and 79,688.07 is: 109,994.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,589.55 : 142,985.66 = 79,688.07 : x
  2. Step 2: Convert to fraction form
    103,589.55/142,985.66 = 79,688.07/x
  3. Step 3: Cross multiply
    103,589.55x = 142,985.66 × 79,688.07
  4. Step 4: Simplify right side
    103,589.55x = 11,394,250,884.64
  5. Step 5: Solve for x
    x = 11,394,250,884.64/103,589.55
  6. Step 6: Final answer
    x = 109,994.21

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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.