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Finding the Fourth Proportional to 128,416.60, 192,624.90 and 91,018.90

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Solution

The fourth proportional to 128,416.60, 192,624.90 and 91,018.90 is: 136,528.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,416.60 : 192,624.90 = 91,018.90 : x
  2. Step 2: Convert to fraction form
    128,416.60/192,624.90 = 91,018.90/x
  3. Step 3: Cross multiply
    128,416.60x = 192,624.90 × 91,018.90
  4. Step 4: Simplify right side
    128,416.60x = 17,532,506,510.61
  5. Step 5: Solve for x
    x = 17,532,506,510.61/128,416.60
  6. Step 6: Final answer
    x = 136,528.35

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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.