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Finding the Fourth Proportional to 91,275.70, 136,913.55 and 80,830.90

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Solution

The fourth proportional to 91,275.70, 136,913.55 and 80,830.90 is: 121,246.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,275.70 : 136,913.55 = 80,830.90 : x
  2. Step 2: Convert to fraction form
    91,275.70/136,913.55 = 80,830.90/x
  3. Step 3: Cross multiply
    91,275.70x = 136,913.55 × 80,830.90
  4. Step 4: Simplify right side
    91,275.70x = 11,066,845,468.70
  5. Step 5: Solve for x
    x = 11,066,845,468.70/91,275.70
  6. Step 6: Final answer
    x = 121,246.35

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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.