Home / 78,637.40-117,725.70-69,421.40

Finding the Fourth Proportional to 78,637.40, 117,725.70 and 69,421.40

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Solution

The fourth proportional to 78,637.40, 117,725.70 and 69,421.40 is: 103,928.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,637.40 : 117,725.70 = 69,421.40 : x
  2. Step 2: Convert to fraction form
    78,637.40/117,725.70 = 69,421.40/x
  3. Step 3: Cross multiply
    78,637.40x = 117,725.70 × 69,421.40
  4. Step 4: Simplify right side
    78,637.40x = 8,172,682,909.98
  5. Step 5: Solve for x
    x = 8,172,682,909.98/78,637.40
  6. Step 6: Final answer
    x = 103,928.70

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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.