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Finding the Fourth Proportional to 91,085.60, 136,730.80 and 70,400.80

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Solution

The fourth proportional to 91,085.60, 136,730.80 and 70,400.80 is: 105,680.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,085.60 : 136,730.80 = 70,400.80 : x
  2. Step 2: Convert to fraction form
    91,085.60/136,730.80 = 70,400.80/x
  3. Step 3: Cross multiply
    91,085.60x = 136,730.80 × 70,400.80
  4. Step 4: Simplify right side
    91,085.60x = 9,625,957,704.64
  5. Step 5: Solve for x
    x = 9,625,957,704.64/91,085.60
  6. Step 6: Final answer
    x = 105,680.35

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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.