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Finding the Fourth Proportional to 420,570.60, 580,309.79 and 239,271.95

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Solution

The fourth proportional to 420,570.60, 580,309.79 and 239,271.95 is: 330,151.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,570.60 : 580,309.79 = 239,271.95 : x
  2. Step 2: Convert to fraction form
    420,570.60/580,309.79 = 239,271.95/x
  3. Step 3: Cross multiply
    420,570.60x = 580,309.79 × 239,271.95
  4. Step 4: Simplify right side
    420,570.60x = 138,851,852,047.56
  5. Step 5: Solve for x
    x = 138,851,852,047.56/420,570.60
  6. Step 6: Final answer
    x = 330,151.11

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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.