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Finding the Fourth Proportional to 661,990, 913,560.80 and 360,184

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Solution

The fourth proportional to 661,990, 913,560.80 and 360,184 is: 497,061.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,990 : 913,560.80 = 360,184 : x
  2. Step 2: Convert to fraction form
    661,990/913,560.80 = 360,184/x
  3. Step 3: Cross multiply
    661,990x = 913,560.80 × 360,184
  4. Step 4: Simplify right side
    661,990x = 329,049,983,187.20
  5. Step 5: Solve for x
    x = 329,049,983,187.20/661,990
  6. Step 6: Final answer
    x = 497,061.86

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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.