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Finding the Fourth Proportional to 438,320.80, 657,740.40 and 288,992.80

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Solution

The fourth proportional to 438,320.80, 657,740.40 and 288,992.80 is: 433,660.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,320.80 : 657,740.40 = 288,992.80 : x
  2. Step 2: Convert to fraction form
    438,320.80/657,740.40 = 288,992.80/x
  3. Step 3: Cross multiply
    438,320.80x = 657,740.40 × 288,992.80
  4. Step 4: Simplify right side
    438,320.80x = 190,082,239,869.12
  5. Step 5: Solve for x
    x = 190,082,239,869.12/438,320.80
  6. Step 6: Final answer
    x = 433,660.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.