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Finding the Fourth Proportional to 86,019.60, 129,029.40 and 81,426.90

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Solution

The fourth proportional to 86,019.60, 129,029.40 and 81,426.90 is: 122,140.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019.60 : 129,029.40 = 81,426.90 : x
  2. Step 2: Convert to fraction form
    86,019.60/129,029.40 = 81,426.90/x
  3. Step 3: Cross multiply
    86,019.60x = 129,029.40 × 81,426.90
  4. Step 4: Simplify right side
    86,019.60x = 10,506,464,050.86
  5. Step 5: Solve for x
    x = 10,506,464,050.86/86,019.60
  6. Step 6: Final answer
    x = 122,140.35

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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.