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Finding the Fourth Proportional to 388,835.40, 536,592.80 and 209,987.40

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Solution

The fourth proportional to 388,835.40, 536,592.80 and 209,987.40 is: 289,782.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,835.40 : 536,592.80 = 209,987.40 : x
  2. Step 2: Convert to fraction form
    388,835.40/536,592.80 = 209,987.40/x
  3. Step 3: Cross multiply
    388,835.40x = 536,592.80 × 209,987.40
  4. Step 4: Simplify right side
    388,835.40x = 112,677,726,930.72
  5. Step 5: Solve for x
    x = 112,677,726,930.72/388,835.40
  6. Step 6: Final answer
    x = 289,782.58

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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.