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Finding the Fourth Proportional to 86,641.90, 129,667.16 and 72,617.77

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Solution

The fourth proportional to 86,641.90, 129,667.16 and 72,617.77 is: 108,678.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,641.90 : 129,667.16 = 72,617.77 : x
  2. Step 2: Convert to fraction form
    86,641.90/129,667.16 = 72,617.77/x
  3. Step 3: Cross multiply
    86,641.90x = 129,667.16 × 72,617.77
  4. Step 4: Simplify right side
    86,641.90x = 9,416,139,192.61
  5. Step 5: Solve for x
    x = 9,416,139,192.61/86,641.90
  6. Step 6: Final answer
    x = 108,678.81

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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.