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Finding the Fourth Proportional to 291,981.60, 438,118.20 and 165,718.80

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Solution

The fourth proportional to 291,981.60, 438,118.20 and 165,718.80 is: 248,660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,981.60 : 438,118.20 = 165,718.80 : x
  2. Step 2: Convert to fraction form
    291,981.60/438,118.20 = 165,718.80/x
  3. Step 3: Cross multiply
    291,981.60x = 438,118.20 × 165,718.80
  4. Step 4: Simplify right side
    291,981.60x = 72,604,422,362.16
  5. Step 5: Solve for x
    x = 72,604,422,362.16/291,981.60
  6. Step 6: Final answer
    x = 248,660.95

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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.