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Finding the Fourth Proportional to 608,409.36, 839,717.23 and 390,889.95

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Solution

The fourth proportional to 608,409.36, 839,717.23 and 390,889.95 is: 539,500.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,409.36 : 839,717.23 = 390,889.95 : x
  2. Step 2: Convert to fraction form
    608,409.36/839,717.23 = 390,889.95/x
  3. Step 3: Cross multiply
    608,409.36x = 839,717.23 × 390,889.95
  4. Step 4: Simplify right side
    608,409.36x = 328,237,026,048.84
  5. Step 5: Solve for x
    x = 328,237,026,048.84/608,409.36
  6. Step 6: Final answer
    x = 539,500.29

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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.