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Finding the Fourth Proportional to 353,405.84, 487,663.64 and 210,138.20

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Solution

The fourth proportional to 353,405.84, 487,663.64 and 210,138.20 is: 289,969.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,405.84 : 487,663.64 = 210,138.20 : x
  2. Step 2: Convert to fraction form
    353,405.84/487,663.64 = 210,138.20/x
  3. Step 3: Cross multiply
    353,405.84x = 487,663.64 × 210,138.20
  4. Step 4: Simplify right side
    353,405.84x = 102,476,758,642.80
  5. Step 5: Solve for x
    x = 102,476,758,642.80/353,405.84
  6. Step 6: Final answer
    x = 289,969.06

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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.