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Finding the Fourth Proportional to 388,938.80, 536,735.88 and 210,090.80

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Solution

The fourth proportional to 388,938.80, 536,735.88 and 210,090.80 is: 289,925.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,938.80 : 536,735.88 = 210,090.80 : x
  2. Step 2: Convert to fraction form
    388,938.80/536,735.88 = 210,090.80/x
  3. Step 3: Cross multiply
    388,938.80x = 536,735.88 × 210,090.80
  4. Step 4: Simplify right side
    388,938.80x = 112,763,270,417.90
  5. Step 5: Solve for x
    x = 112,763,270,417.90/388,938.80
  6. Step 6: Final answer
    x = 289,925.49

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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.