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Finding the Fourth Proportional to 421,000.50, 580,981.30 and 239,712.50

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Solution

The fourth proportional to 421,000.50, 580,981.30 and 239,712.50 is: 330,803.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,000.50 : 580,981.30 = 239,712.50 : x
  2. Step 2: Convert to fraction form
    421,000.50/580,981.30 = 239,712.50/x
  3. Step 3: Cross multiply
    421,000.50x = 580,981.30 × 239,712.50
  4. Step 4: Simplify right side
    421,000.50x = 139,268,479,876.25
  5. Step 5: Solve for x
    x = 139,268,479,876.25/421,000.50
  6. Step 6: Final answer
    x = 330,803.60

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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.