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Finding the Fourth Proportional to 170,021.40, 255,032.10 and 91,289.40

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Solution

The fourth proportional to 170,021.40, 255,032.10 and 91,289.40 is: 136,934.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,021.40 : 255,032.10 = 91,289.40 : x
  2. Step 2: Convert to fraction form
    170,021.40/255,032.10 = 91,289.40/x
  3. Step 3: Cross multiply
    170,021.40x = 255,032.10 × 91,289.40
  4. Step 4: Simplify right side
    170,021.40x = 23,281,727,389.74
  5. Step 5: Solve for x
    x = 23,281,727,389.74/170,021.40
  6. Step 6: Final answer
    x = 136,934.10

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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.