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Finding the Fourth Proportional to 490,639.95, 676,983.87 and 286,651.47

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Solution

The fourth proportional to 490,639.95, 676,983.87 and 286,651.47 is: 395,521.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,639.95 : 676,983.87 = 286,651.47 : x
  2. Step 2: Convert to fraction form
    490,639.95/676,983.87 = 286,651.47/x
  3. Step 3: Cross multiply
    490,639.95x = 676,983.87 × 286,651.47
  4. Step 4: Simplify right side
    490,639.95x = 194,058,421,501.79
  5. Step 5: Solve for x
    x = 194,058,421,501.79/490,639.95
  6. Step 6: Final answer
    x = 395,521.04

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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.