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Finding the Fourth Proportional to 438,287.40, 657,431.10 and 280,823.40

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Solution

The fourth proportional to 438,287.40, 657,431.10 and 280,823.40 is: 421,235.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,287.40 : 657,431.10 = 280,823.40 : x
  2. Step 2: Convert to fraction form
    438,287.40/657,431.10 = 280,823.40/x
  3. Step 3: Cross multiply
    438,287.40x = 657,431.10 × 280,823.40
  4. Step 4: Simplify right side
    438,287.40x = 184,622,036,767.74
  5. Step 5: Solve for x
    x = 184,622,036,767.74/438,287.40
  6. Step 6: Final answer
    x = 421,235.10

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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.