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Finding the Fourth Proportional to 155,970.83, 215,216.98 and 87,990.77

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Solution

The fourth proportional to 155,970.83, 215,216.98 and 87,990.77 is: 121,414.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,970.83 : 215,216.98 = 87,990.77 : x
  2. Step 2: Convert to fraction form
    155,970.83/215,216.98 = 87,990.77/x
  3. Step 3: Cross multiply
    155,970.83x = 215,216.98 × 87,990.77
  4. Step 4: Simplify right side
    155,970.83x = 18,937,106,491.21
  5. Step 5: Solve for x
    x = 18,937,106,491.21/155,970.83
  6. Step 6: Final answer
    x = 121,414.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.