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Finding the Fourth Proportional to 991.78, 1,485.52 and 470.98

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Solution

The fourth proportional to 991.78, 1,485.52 and 470.98 is: 705.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.78 : 1,485.52 = 470.98 : x
  2. Step 2: Convert to fraction form
    991.78/1,485.52 = 470.98/x
  3. Step 3: Cross multiply
    991.78x = 1,485.52 × 470.98
  4. Step 4: Simplify right side
    991.78x = 699,650.21
  5. Step 5: Solve for x
    x = 699,650.21/991.78
  6. Step 6: Final answer
    x = 705.45

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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.