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Finding the Fourth Proportional to 900.86, 1,351.30 and 387.50

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Solution

The fourth proportional to 900.86, 1,351.30 and 387.50 is: 581.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.86 : 1,351.30 = 387.50 : x
  2. Step 2: Convert to fraction form
    900.86/1,351.30 = 387.50/x
  3. Step 3: Cross multiply
    900.86x = 1,351.30 × 387.50
  4. Step 4: Simplify right side
    900.86x = 523,628.75
  5. Step 5: Solve for x
    x = 523,628.75/900.86
  6. Step 6: Final answer
    x = 581.25

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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.