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Finding the Fourth Proportional to 80,657.40, 121,010.40 and 57,329.40

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Solution

The fourth proportional to 80,657.40, 121,010.40 and 57,329.40 is: 86,011.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,657.40 : 121,010.40 = 57,329.40 : x
  2. Step 2: Convert to fraction form
    80,657.40/121,010.40 = 57,329.40/x
  3. Step 3: Cross multiply
    80,657.40x = 121,010.40 × 57,329.40
  4. Step 4: Simplify right side
    80,657.40x = 6,937,453,625.76
  5. Step 5: Solve for x
    x = 6,937,453,625.76/80,657.40
  6. Step 6: Final answer
    x = 86,011.37

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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.